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DTSTART;TZID=America/Los_Angeles:20260206T110000
DTEND;TZID=America/Los_Angeles:20260206T121500
DTSTAMP:20260127T164006Z
CREATED:20260110T215526Z
LAST-MODIFIED:20260127T164006Z
UID:3946-1770375600-1770380100@colleges.claremont.edu
SUMMARY:CCMS Colloquium: Teal Witter (CMC)
DESCRIPTION:CCMS Colloquium invites you to a talk by Teal Witter (CMC)\n\n \nTitle:  Exactly Computing do-Shapley Values\n \n\nAbstract:  \nCausal questions lie at the heart of scientific inquiry\, from evaluating economic policies to determining medical treatments. Yet\, observational data alone is often insufficient due to the fundamental problem of causal inference: we cannot observe the counterfactual world where a specific intervention did not occur. Structural Causal Models (SCMs) offer a powerful solution by explicitly modeling the underlying mechanisms of a system. By formalizing data generation\, SCMs allow us to use the do-operator to rigorously simulate interventions\, answering questions like\, “If a patient were administered prednisone and made to stop smoking\, what would be their expected pain level?”\n\nHowever\, characterizing a system through individual queries is computationally daunting. As the number of features d grows\, the landscape of possible interventions scales exponentially (2^d). To extract interpretable insights from this combinatorial complexity\, we utilize the do-Shapley value\, a game-theoretic framework that attributes the complicated dynamics of an SCM to individual features.\n\nIn this talk\, I will present a new algorithmic approach that makes computing these values more tractable. We show that the causal landscape is structured into “irreducible sets”\, a building block where multiple interventions yield identical effects. By leveraging this structure\, we introduce an algorithm that computes do-Shapley values exactly\, with runtime that depends on the graph’s complexity rather than 2^d. We further propose an estimator that targets these sets directly\, producing more accurate estimates than prior work by several orders of magnitude or more.\n\nJoint work with Álvaro Parafita\, Tomas Garriga\, Maximilian Muschalik\, Fabian Fumagalli\, Axel Brando\, and Lucas Rosenblatt.\n\n \nBio: Teal is an Assistant Professor of Mathematics and Computer Science at Claremont McKenna College. His recent research explores randomized algorithms for problems in explainable AI and generative AI. More broadly\, he is interested in leveraging ideas from theoretical computer science and machine learning to design provably accurate algorithms. Before joining the consortium\, Teal completed his Ph.D. in Computer Science at New York University\, where he was supported by an NSF Graduate Research Fellowship. Prior to graduate school\, Teal attended Middlebury College.
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-teal-witter-cmc/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Sam Nelson":MAILTO:snelson@cmc.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20260130T110000
DTEND;TZID=America/Los_Angeles:20260130T121500
DTSTAMP:20260127T020408Z
CREATED:20260110T204139Z
LAST-MODIFIED:20260127T020408Z
UID:3944-1769770800-1769775300@colleges.claremont.edu
SUMMARY:CCMS Colloquium: John Baez (UCR)
DESCRIPTION:CCMS Colloquium invites you to a talk by John Baez (UCR)\n\n \nTitle: The mathematics of tuning systems\n \nAbstract: Leibniz said “Music is the pleasure the human mind experiences from counting without being aware that it is counting.”  The first step is choosing a tuning system — the frequency ratios between pitches in a scale.  Different kinds of music sound best in different tuning systems!  In music from the Middle Ages until today\, new musical styles have gone hand in hand with mathematical innovations in tuning systems.  Here I will focus on a few of the most important and beautiful Western systems\, from Pythagorean tuning to today’s reigning champion: equal temperament. Can you hear the difference?  What will come next?\n \n  \nBio:   \nJohn Baez is a mathematical physicist\, formerly at U. C. Riverside and currently the Maxwell Fellow at the University of Edinburgh.   He is known for the Cobordism Hypothesis connecting manifolds to higher categories.  In 1993 he began writing This Week’s Finds in Mathematical Physics\, which has been called the world’s first blog.   Since then he has helped start two well-known blogs: The n-Category Caf e\, a group blog on math and physics\, and Azimuth\, on mathematics and ecological issues.   He also writes a regular column in Notices of the American Mathematical Society.
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-john-baez-ucr/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Sam Nelson":MAILTO:snelson@cmc.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20251205T110000
DTEND;TZID=America/Los_Angeles:20251205T121500
DTSTAMP:20251205T155429Z
CREATED:20250923T142446Z
LAST-MODIFIED:20251205T155429Z
UID:3868-1764932400-1764936900@colleges.claremont.edu
SUMMARY:CCMS Colloquium: Konstantin Zuev (Caltech)
DESCRIPTION:CCMS Colloquium invites you to a talk by Konstantin Zuev (Caltech)\n\n \nTitle: Course-Prerequisite Networks\n \nAbstract: An academic curriculum is a complex system of courses and their interactions that lies at the heart of an academic institution and underlies its educational mission. Understanding these systems is essential for providing high-quality education. Course-prerequisite networks (CPNs) are directed acyclic graphs that model academic curricula by representing courses as nodes and prerequisite relationships between them as directed links. In this talk\, we will show how CPNs can be used to visualize\, analyze\, and optimize curricula; identify key courses; allocate teaching resources; quantify the strength of knowledge flow between departments; and uncover the most influential and interdisciplinary areas of study. The proposed methodology applies to any CPN and is illustrated using a network of courses taught at the California Institute of Technology. If time permits\, we will also discuss three new global CPN measures\, breadth\, depth\, and flux\, which enable macro-scale comparisons of different curricula. We illustrate these measures numerically using three real and synthetic CPNs from the Cyprus University of Technology\, the California Institute of Technology\, and Johns Hopkins University.\n \nBio: Dr. Konstantin Zuev is a Teaching Professor of Computing and Mathematical Sciences at the California Institute of Technology\, where he teaches a variety of courses in mathematics and statistics and conducts research on network science with undergraduate students. He is the author of about 30 papers and a forthcoming book\, Fundamentals of Statistical Inference: Foundations of Data Analysis. His teaching and research have been recognized with several awards: the ASCIT Teaching Award (2018 & 2023)\, the Carver Mead Seed Fund Grant (2023)\, the Graduate Student Council Teaching Award (2023)\, the Humboldt Research Fellowship for Experienced Researchers (2021)\, and the Northrop Grumman Prize for Excellence in Teaching (2019). For more information about his background\, please visit http://www.its.caltech.edu/~zuev/index.html
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-konstantin-zuev-caltech/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20251128T110000
DTEND;TZID=America/Los_Angeles:20251128T121500
DTSTAMP:20250923T142753Z
CREATED:20250923T142737Z
LAST-MODIFIED:20250923T142753Z
UID:3869-1764327600-1764332100@colleges.claremont.edu
SUMMARY:NO CCMS Colloquium this Friday!
DESCRIPTION:We’ll be back next week! \nHappy Thanksgiving!
URL:https://colleges.claremont.edu/ccms/event/no-ccms-colloquium-this-friday/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20251121T110000
DTEND;TZID=America/Los_Angeles:20251121T121500
DTSTAMP:20251119T170700Z
CREATED:20250923T141914Z
LAST-MODIFIED:20251119T170700Z
UID:3866-1763722800-1763727300@colleges.claremont.edu
SUMMARY:CCMS Colloquium: Shriya Nagpal (Pitzer)
DESCRIPTION:CCMS Colloquium invites you to a talk by Shriya Nagpal (Pitzer)\n\n \nTitle: Synchronization in Erdős–Rényi Graphs with Kuramoto Dynamics: A Graphon Approach\n \nAbstract: Networks of coupled Kuramoto oscillators have been used to model a wide array of phenomena\, including circadian rhythms\, flashing fireflies\, and high-voltage electric grids. In many such applications\, synchronization is an emergent behavior of interest. Recent work has focused on understanding synchronization in random networks of Kuramoto oscillators. We contribute to this literature\, by considering interaction networks generated by a graphon model known as a $W$-random network\, and examine the dynamics of an infinite number of identical ​ Kuramoto oscillators. We show that with sufficient regularity on $W$\, the solution to the dynamical system over a $W$-random network of size $n$ converges to the solution of the infinite graphon system\, with high probability as $n\rightarrow\infty$. We leverage this convergence result to study synchronization for identical Kuramoto oscillators on Erd\H{o}s-R\’enyi random graphs.\n \nBio: Shriya V. Nagpal is an Assistant Professor of Mathematics at Pitzer College. In 2024\, she completed her Ph.D. in Applied Mathematics at Cornell University\, where she was co-advised by Francesca Parise and Lindsay Anderson. Prior to joining Cornell in 2018\, she received her bachelor’s degree in Mathematics from Trinity College. Her research leverages tools from network theory and dynamical systems to study emergent behavior in interconnected systems.
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-shriya-nagpal-pitzer/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20251114T110000
DTEND;TZID=America/Los_Angeles:20251114T121500
DTSTAMP:20251112T013211Z
CREATED:20250923T141739Z
LAST-MODIFIED:20251112T013211Z
UID:3865-1763118000-1763122500@colleges.claremont.edu
SUMMARY:CCMS Colloquium: Robert Sanchez (HMC)
DESCRIPTION:CCMS Colloquium invites you to a talk by Robert Sanchez (HMC)\n\n \nTitle: Tides: Under the Sea and Under the Ice\n \nAbstract: Physical oceanography is the study of ocean fluid dynamics (e.g.\, waves\, currents\, plumes\, turbulence). This talk will introduce physical oceanography and the methods used to analyze ocean data such as time-series analysis and numerical solutions to differential equations. We will use these methods to investigate the tidally driven waves in a glacial fjord. Data analysis and numerical modeling of the system suggest a surprising origin for the waves with potential consequences for the melting of glaciers.\n \nBio: Robert Sanchez is a new Assistant Professor at Harvey Mudd College with a joint appointment between the Mathematics Department and the Hixon Center for the Climate and Environment. Prior to Harvey Mudd\, he was an NSF Postdoc Scholar at the University of Florida and he received his PhD in Physical Oceanography from the Scripps Institution of Oceanography. \n 
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-robert-sanchez-hmc/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20251107T110000
DTEND;TZID=America/Los_Angeles:20251107T121500
DTSTAMP:20251103T173924Z
CREATED:20250923T141522Z
LAST-MODIFIED:20251103T173924Z
UID:3864-1762513200-1762517700@colleges.claremont.edu
SUMMARY:CCMS Colloquium: Jemma Lorenat (Pitzer)
DESCRIPTION:CCMS Colloquium invites you to a talk by Jemma Lorenat (Pitzer)\n\n \nTitle: Recognizing data: statistical literacies around 1900\n \nAbstract: This talk centers on the first (and perhaps only) doctorate in the theory of correlations\, granted by University College London in 1899 to Alice Lee. The production and reception of Lee’s research sheds light on the varieties of statistical literacies around 1900.\n \nBio: Jemma Lorenat is a historian of mathematics at Pitzer College. She spends a great deal of time thinking about the history and future of statistical literacies. She also loves conic sections and (some) other algebraic curves.
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-jemma-lorenat-pitzer/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20251031T110000
DTEND;TZID=America/Los_Angeles:20251031T121500
DTSTAMP:20251030T024823Z
CREATED:20250923T141345Z
LAST-MODIFIED:20251030T024823Z
UID:3862-1761908400-1761912900@colleges.claremont.edu
SUMMARY:CCMS Colloquium: Anna Ma (UCI)
DESCRIPTION:CCMS Colloquium invites you to a talk by Anna Ma (UCI)\n\n \nTitle: Stochastic iterative methods for solving tensor linear systems\n \nAbstract: Solving linear systems is a crucial subroutine and challenge in data science and scientific computing. Classical approaches for solving linear systems assume that data is readily available and small enough to be stored in memory. However\, in the large-scale data setting\, data may be so large that only partitions (e.g.\, single rows/columns of the matrix/tensor) can be utilized at a time. In this presentation\, we discuss the advantages and role of randomization in iterative methods for approximating the solution to large-scale linear systems. Time permitting\, we will also discuss our recent work on applications to solving systems involving higher-dimensional arrays\, or tensors. Unlike previously proposed randomized iterative strategies\, such as the tensor randomized Kaczmarz method (row slice method) or the tensor Gauss-Seidel method (column slice method)\, which are natural extensions of their matrix counterparts\, our approach delves into a distinct scenario utilizing frontal slice sketching.\n \nBio: Dr. Anna Ma is an Assistant Professor at UC Irvine in the Department of Mathematics. Prior to her position at UCI\, she was a Visiting Assistant Professor at UCI and a UC Chancellor’s Postdoctoral Fellow at UC San Diego in the Department of Mathematics. Her research interests are in randomized algorithms\, numerical linear algebra\, and the mathematics of data science. She is also interested in data visualization and unsupervised machine learning. Anna earned her BS in Mathematics at UC Los Angeles. She received her PhD in Computational Science from Claremont Graduate University and the Computational Science Research Center at San Diego State University\, where she studied the design and analysis of algorithms that solve problems involving large-scale data. \n 
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-anna-ma-uci/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20251024T110000
DTEND;TZID=America/Los_Angeles:20251024T121500
DTSTAMP:20251023T215848Z
CREATED:20250923T141134Z
LAST-MODIFIED:20251023T215848Z
UID:3861-1761303600-1761308100@colleges.claremont.edu
SUMMARY:CCMS Colloquium: Braxton Osting (University of Utah)
DESCRIPTION:CCMS Colloquium invites you to a talk by Braxton Osting (University of Utah)\n\n \nTitle: Blood pressure monitoring with biophysics-informed machine learning models\n\n \nAbstract: Measurement of blood pressure (BP) is essential for early diagnosis and management of hypertension\, a condition that 45% of US adults have and a risk factor for development of heart failure\, the leading cause of death in the US. Wearable technologies have the potential to transform BP monitoring by providing continuous assessments of cardiovascular health metrics and guiding clinical management. However\, existing cuffless wearable devices for BP monitoring often rely on methods lacking theoretical foundations\, such as pulse wave analysis or pulse arrival time\, making them vulnerable to physiological and experimental confounders that undermine their accuracy and clinical utility. We developed a smartwatch device with real-time electrical bioimpedance (BioZ) sensing for cuffless hemodynamic monitoring. We elucidate the biophysical relationship between BioZ and BP via a multiscale analytical and computational modeling framework\, and identify physiological\, anatomical\, and experimental parameters that influence the pulsatile BioZ signal at the wrist. A signal-tagged physics-informed neural network incorporating fluid dynamics principles enables calibration-free estimation of BP and radial and axial blood velocity. We successfully tested our approach with healthy individuals at rest and after physical activity including physical and autonomic challenges\, and with patients with hypertension and cardiovascular disease in outpatient and intensive care settings. Our findings demonstrate the feasibility of BioZ technology for cuffless BP and blood velocity monitoring\, addressing critical limitations of existing cuffless technologies.\n \nBio:  Braxton Osting is a Professor in the Department of Mathematics at the University of Utah where he works on mathematical challenges in the natural and applied sciences. He has broad interests in analytical and computational methods for problems in applied mathematics\, especially in optimization\, partial differential equations\, computational geometry\, and machine learning. \nAfter attending the University of Washington for his undergraduate studies\, Braxton earned a Ph.D. in Applied Mathematics at Columbia University. Before moving to Utah\, he was an NSF Postdoctoral Fellow in the Department of Mathematics at the University of California\, Los Angeles. \nIn his free time\, Braxton enjoys biking\, skiing\, running\, hiking\, and generally spending time outdoors. \n 
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-selim-esedoglu-university-of-michigan/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20251017T110000
DTEND;TZID=America/Los_Angeles:20251017T121500
DTSTAMP:20251015T215610Z
CREATED:20250923T142244Z
LAST-MODIFIED:20251015T215610Z
UID:3867-1760698800-1760703300@colleges.claremont.edu
SUMMARY:CCMS Colloquium: Fall break Panel
DESCRIPTION:Please join us for a career discussion with three great panelists: \nSireesh Vinnakota – Graduate Student at UCI \nLuke Trujillo – Senior Software Engineer at Operant AI \nMichelle Goodwin – Trader at Allspring Global Investments \n  \nThis will be a virtual meeting only. \nZoom link: https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcmc-its.zoom.us%2Fj%2F83719659422&data=05%7C02%7Cluisa.gianuca%40cgu.edu%7C46994ae71bc5453cc6a908de0a886a47%7C19afb2c85efd4718a107530ed963d11e%7C0%7C0%7C638959778224324835%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=8pRyjqWBxWliFUf5ciI8doXyCYTzyIJ9NSrX6obEMwA%3D&reserved=0 \nMeeting ID: 837 1965 9422
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-fall-break-panel/
CATEGORIES:Colloquium
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20251010T110000
DTEND;TZID=America/Los_Angeles:20251010T121500
DTSTAMP:20251008T232409Z
CREATED:20250923T140917Z
LAST-MODIFIED:20251008T232409Z
UID:3860-1760094000-1760098500@colleges.claremont.edu
SUMMARY:CCMS Colloquium: Sinai Robins (University of São Paulo - Brazil)
DESCRIPTION:CCMS Colloquium invites you to a talk by Sinai Robins (University of São Paulo – Brazil)\n\n \nTitle: An introduction to the geometry of numbers through the lens of analysis\n \n\nAbstract: We introduce the geometry of numbers\, beginning from the first principles\, and proceeding to modern research topics in the field. Our point of view includes Fourier analysis on compact sets and in particular on convex bodies. We give some recent extensions of previous results by C. L. Siegel\, and E. Bombieri\, both of whom extended Minkowski’s first theorem for convex\, centrally symmetric bodies. \nA discrete version of these results allows us to give some new formulations for finite sums of discrete covariograms\, for any finite set of integer points in Euclidean space. We’ll give visual examples\, with pictures\, of everything in dimension 2. On the other hand\, a continuous application of these results allows us to shed additional light on the enumeration of lattice points in polytopes in R^d\, and in particular some Ehrhart-type theory. This is joint work with Michel Faleiros. \n\n \nBio: Professor Sinai Robins completed his Ph.D. in Number Theory at UCLA. He has held tenured positions at Temple University and Nanyang Technological University and is currently a full professor at the University of São Paulo\, Brasil. Professor Robins enjoys tackling problems in Discrete Geometry\, Fourier Analysis\, Number Theory\, Combinatorial Optimization\, and Data Science. Some of his recent research is reflected in his new 2024 book\, called Fourier analysis on polytopes and the geometry of numbers: Part I\, a gentle introduction. This book offers a unique\, modern\, Fourier-analytic perspective on the geometry of numbers. It explores the relationship between geometric properties of a polytope and its Fourier transform\, provides new streamlined proofs of fundamental results\, and invites undergraduates to explore these important ideas.
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-sinai-robins-university-of-sao-paulo-brazil/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20251003T110000
DTEND;TZID=America/Los_Angeles:20251003T121500
DTSTAMP:20251003T021636Z
CREATED:20250923T140603Z
LAST-MODIFIED:20251003T021636Z
UID:3859-1759489200-1759493700@colleges.claremont.edu
SUMMARY:CCMS Colloquium: Ruby Kim (University of Michigan)
DESCRIPTION:CCMS Colloquium invites you to a talk by Ruby Kim (University of Michigan) \nTitle: Mathematical Models of Circadian Rhythms and Seasonal Timing\n \nAbstract: The circadian clock shapes nearly 24-hour periodic rhythms throughout the body\, from the activity of individual cells to our daily sleep/wake cycles. These rhythms can be self-sustained (for example\, people still show circadian patterns even in total darkness)\, but they are also strongly influenced by the environment\, especially light. Mathematical models of circadian rhythms have provided insight into many intriguing phenomena\, including jet lag\, mid-afternoon fatigue\, and how animals sense the changing seasons. In this talk\, I will introduce how mathematical models of circadian rhythms are constructed and used. Then\, I will share recent work on seasonal timing in a large population of medical interns\, using data collected from wearable devices. Our results suggest that seasonal timing plays a key role in how people respond to shift work. Overall\, the goal of this talk is to introduce how mathematical modeling can be used to better understand biological rhythms and their impact on daily life.\n \nBio: I am originally from Koreatown\, Los Angeles. I did my undergraduate studies at Pomona College (Class of ’17)\, where I majored in math and completed a thesis under the mentorship of Dr. Ami Radunskaya. I enjoyed teaching mathematics and doing research\, so I decided to pursue graduate studies in math at Duke University. During my PhD\, I fell in love with biological rhythms and mathematical neuroscience. Currently\, I am a postdoc at the University of Michigan using mathematical modeling and data science to study biology and health. During my free time\, I enjoy playing pool\, hanging out with my dog\, and reading.
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-ruby-kim-university-of-michigan/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20250926T110000
DTEND;TZID=America/Los_Angeles:20250926T121500
DTSTAMP:20250922T185920Z
CREATED:20250917T194906Z
LAST-MODIFIED:20250922T185920Z
UID:3839-1758884400-1758888900@colleges.claremont.edu
SUMMARY:CCMS Colloquium: Robert Cass (CMC)
DESCRIPTION:CCMS Colloquium invites you to a talk by Assistant Professor of Mathematics Robert Cass of Claremont McKenna College:\n\n \nTitle: An introduction to the Langlands program\n \nAbstract: Class field theory\, which was established in the early 20th century\, has its origins in Gauss’s law of quadratic reciprocity. As such\, it allows one to determine whether certain integer polynomials have a root mod p. The Langlands program is a vast area of current research in number theory that can be viewed as a generalization of class field theory to all integer polynomials. In this talk\, I will give a leisurely introduction to this circle of ideas by way of some concrete examples. I will conclude with my own work\, which includes a result on the independence of the cohomology theory chosen in a geometric and categorical analogue of the Langlands program.\n \nBrief Bio: Robert Cass joined the Mathematical Sciences Department at CMC as an Assistant Professor of Mathematics this fall. He received his B.S. from the University of Kentucky and his Ph.D. from Harvard University. After that\, he was an NSF postdoctoral fellow at Caltech and the University of Michigan. He is interested in the Langlands program and arithmetic geometry\, as well as related problems in algebraic geometry and representation theory. He enjoys mathematical questions that are simple to state but whose solutions involve tools from multiple disciplines\, especially those with unexpected connections to geometry.
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-robert-cass-cmc/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20250919T110000
DTEND;TZID=America/Los_Angeles:20250919T120000
DTSTAMP:20250917T194549Z
CREATED:20250903T163230Z
LAST-MODIFIED:20250917T194549Z
UID:3817-1758279600-1758283200@colleges.claremont.edu
SUMMARY:NO CCMS Colloquium this Friday!
DESCRIPTION:We’ll be back next week!
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20250912T110000
DTEND;TZID=America/Los_Angeles:20250912T120000
DTSTAMP:20250909T001255Z
CREATED:20250903T160356Z
LAST-MODIFIED:20250909T001255Z
UID:3816-1757674800-1757678400@colleges.claremont.edu
SUMMARY:CCMS Colloquium: Morse theory\, Floer homology\, and string topology (Ko Honda\, UCLA)
DESCRIPTION:CCMS Colloquium invites you to a talk by Professor Ko Honda\, Professor of Mathematics at UCLA. \nTitle: Morse theory\, Floer homology\, and string topology \nAbstract: One of the most important theories in geometry/topology is Floer homology\, which can be viewed as a Morse theory of a loop space of a manifold (a generalization of a surface to higher dimensions).  The aim of this talk is to give a gentle pictorial introduction to Morse theory for surfaces and then upgrade it in two steps: to Morse theory of loop spaces (e.g.\, of the 2-dimensional sphere) and then to “multiloops” (collections of many loops).  The last upgrade is intimately related to a mathematical model for string theory called “string topology”\, due to Chas-Sullivan\, and to quantum topology via the HOMFLY polynomial of knots/links. \nSpeaker Bio: Ko Honda is an entirely American-trained mathematician\, receiving his BA and MA from Harvard University in 1992 and PhD from Princeton University in 1997.  After postdocs/visiting positions at Duke\, the University of Georgia\, the American Institute of Mathematics\, and IHES\, he arrived in LA in 2001\, was a faculty member at USC for 12.5 years\, and then moved across town to UCLA\, where he has been for the last 11.5 years.  Sometime during his postdoc at Duke\, he discovered/invented an object called a “bypass” in contact geometry\, which allowed him to simplify the analysis of 3-dimensional contact manifolds and solve several open problems in that area\, some in joint work with Colin\, Etnyre\, and Giroux.  He has been working on contact and symplectic geometry ever since\, gradually branching out into adjacent areas (e.g.\, low-dimensional topology\, Floer theory\, and quantum topology) in the intervening years.
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-presents-title-ko-honda/
LOCATION:Davidson Lecture Hall\, CMC\, 340 E 9th St\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20241203T150000
DTEND;TZID=America/Los_Angeles:20241203T160000
DTSTAMP:20241202T162645Z
CREATED:20240928T045355Z
LAST-MODIFIED:20241202T162645Z
UID:3555-1733238000-1733241600@colleges.claremont.edu
SUMMARY:Claremont Topology Seminar: Rhea Palak Bakshi (University of California\, Santa Barbara)
DESCRIPTION:We welcome all undergraduate/graduate students and faculty to attend topology seminar! \nSpeaker: Rhea Palak Bakshi (University of California Santa Barbara) \nTitle: The skein module of the connected sum of two copies of L(0\,1) \nAbstract: Abstract: Skein modules were introduced by Jozef H. Przytycki\, and independently by Vladmimor Turaev\, as generalisations of the Jones\, Kauffman bracket\, and HOMFLYPT polynomial link invariants in the 3-sphere to arbitrary 3-manifolds. The Kauffman bracket skein module (KBSM) is the most extensively studied of all. However\, computing the KBSM of a 3-manifold is known to be notoriously hard\, especially over the ring of Laurent polynomials. Marche conjectured that over the ring of Laurent polynomials\, the KBSM of closed oriented 3-manifolds splits into the sum of free and torsion modules. The counterexample to this conjecture is given by the connected sum of two copies of the real projective space. With the goal of finding a definite structure of the KBSM over this ring\, we compute the skein module of S^1 x S^2 # H_1 and S^1 x S^2 # S^1 x S^2. We show that it is isomorphic to the KBSM of a genus two handlebody modulo some specific handle sliding relations. Moreover\, these handle sliding relations can be written in terms of Chebyshev polynomials. We also discuss whether the KBSM of these manifolds splits into the sums of free and torsion modules. This is joint work with Seongjeong Kim\, Shangjun Shi\, and Xiao Wang.
URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-rhea-palak-bakshi-university-of-california-santa-barbara/
LOCATION:Estella 2099
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20241105T150000
DTEND;TZID=America/Los_Angeles:20241105T160000
DTSTAMP:20241025T175032Z
CREATED:20240928T045017Z
LAST-MODIFIED:20241025T175032Z
UID:3550-1730818800-1730822400@colleges.claremont.edu
SUMMARY:Claremont Topology Seminar: Vijay Higgins (UCLA)
DESCRIPTION:We welcome all undergraduate/graduate students and faculty to attend topology seminar! \nSpeaker: Vijay Higgins (UCLA) \nTitle: Webs and skein algebras \nAbstract: The Jones polynomial of a link can be computed diagrammatically by using skein relations\, which encode the representation theory of SL(2). By considering the vector space spanned by links drawn on a surface and imposing these skein relations\, we obtain an algebra known as the Kauffman bracket skein algebra of the surface. These algebras have been studied by many authors\, including F. Bonahon and H. Wong\, and much is known about their structure. Replacing SL(2) by SL(3) or any other higher rank Lie group gives rise to a new skein algebra involving not only links but also certain graphs called webs. In this talk\, we will discuss some of the complications involved with studying skein algebras built from webs on surfaces and then present ways of getting around them. Some of this work is joint with F. Bonahon.
URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-vijay-higgins-ucla/
LOCATION:Estella 2099
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20241022T150000
DTEND;TZID=America/Los_Angeles:20241022T163000
DTSTAMP:20241015T012146Z
CREATED:20241015T012146Z
LAST-MODIFIED:20241015T012146Z
UID:3574-1729609200-1729614600@colleges.claremont.edu
SUMMARY:Claremont Topology Seminar: Will Hoffer (UC Riverside)
DESCRIPTION:We welcome all undergraduate/graduate students and faculty to attend topology seminar! \nSpeaker: Will Hoffer (UC Riverside) \nTitle: Tube Formulae for Fractal Snowflakes \nAbstract: Fractals like the von Koch snowflake have rough boundaries\, often having nowhere defined tangent lines/spaces. However\, there is a tool useful for probing the edges of such fractals: tubular neighborhoods. In this talk\, we’ll introduce the theory of fractal tube formulae which describe the volumes of such tubular neighborhoods\, illustrating through our recent work on generalized fractal snowflakes. In the process\, we’ll touch on the theory of complex dimensions and tubular zeta functions that capture the (multiplicative) oscillations appearing in the geometry of fractals.
URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-will-hoffer-uc-riverside/
LOCATION:Estella 2099\, Pomona College\, 610 N. College Ave.\, Claremont\, CA\, United States
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20241001T150000
DTEND;TZID=America/Los_Angeles:20241001T160000
DTSTAMP:20240928T044059Z
CREATED:20240928T044059Z
LAST-MODIFIED:20240928T044059Z
UID:3549-1727794800-1727798400@colleges.claremont.edu
SUMMARY:Claremont Topology Seminar: Reginald Anderson (CMC)
DESCRIPTION:We welcome all undergraduate/graduate students and faculty to attend topology seminar! \nSpeaker: Reginald Anderson (CMC) \nTitle: Presentations of derived categories \nAbstract: A modification of the cellular resolution of the diagonal given by Bayer-Popescu-Sturmfels gives a virtual resolution of the diagonal for smooth projective toric varieties and toric Deligne-Mumford stacks which are a global quotient of a smooth projective variety by a finite abelian group. In the past year\, Hanlon-Hicks-Lazarev gave a minimal resolution of the diagonal for toric subvarieties of smooth projective toric varieties. We give implications for exceptional collections on smooth projective toric Fano varieties in dimensions 1-4. This is joint work with CMC undergrads Justin Son\, Hill Zhang\, and Jumari Querimit-Ramirez.
URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-reginald-anderson-cmc-3/
LOCATION:Estella 2099
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20231128T150000
DTEND;TZID=America/Los_Angeles:20231128T160000
DTSTAMP:20231115T195911Z
CREATED:20231115T195911Z
LAST-MODIFIED:20231115T195911Z
UID:3322-1701183600-1701187200@colleges.claremont.edu
SUMMARY:Claremont Topology Seminar: Melody Molander (UCSB)
DESCRIPTION:Title: Skein Theory of Affine ADE Subfactor Planar Algebras \nAbstract: Subfactor planar algebras first were constructed by Vaughan Jones as a diagrammatic axiomatization of the standard invariant of a subfactor. These planar algebras also encode two other invariants of the subfactors: the index and the principal graph. The Kuperberg Program asks to find all diagrammatic presentations of subfactor planar algebras. This program has been completed for index less than 4. In this talk\, I will introduce subfactor planar algebras and give some presentations of subfactor planar algebras of index 4 which have affine ADE Dynkin diagrams as their principal graphs.
URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-melody-molander-ucsb/
LOCATION:Fletcher 110\, Pitzer College\, 1050 N Mills Ave\, Claremont\, CA\, 91711\, United States
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20231114T150000
DTEND;TZID=America/Los_Angeles:20231114T160000
DTSTAMP:20231104T141022Z
CREATED:20231104T140011Z
LAST-MODIFIED:20231104T141022Z
UID:3309-1699974000-1699977600@colleges.claremont.edu
SUMMARY:Geometry and Topology Seminar: Claremont Colleges Course Previews for Spring 2024
DESCRIPTION:On November 14th\, Tuesday from 3-4pm in Fletcher 110\, Geometry and Topology Seminar invites students and faculty to a course preview session devoted to a discussion and presentations about upcoming Spring 2024 courses in \n\ngeometry\,\ntopology and/or\nwith applications in geometry and topology\n\nto help students make their enrollment choices. \nWe will have some refreshments for all attending to enjoy!
URL:https://colleges.claremont.edu/ccms/event/geometry-and-topology-seminar-claremont-colleges-course-previews-for-spring-2024/
LOCATION:Fletcher 110\, Pitzer College\, 1050 N Mills Ave\, Claremont\, CA\, 91711\, United States
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20231107T150000
DTEND;TZID=America/Los_Angeles:20231107T160000
DTSTAMP:20231016T154054Z
CREATED:20230916T033519Z
LAST-MODIFIED:20231016T154054Z
UID:3239-1699369200-1699372800@colleges.claremont.edu
SUMMARY:Claremont Topology Seminar: Hyunki Min (UCLA)
DESCRIPTION:Title: Contact structures and the mapping class group of lens spaces \nAbstract: One important problem in contact topology is to classify contact structures on a given manifold. Around 20 years ago\, Giroux and Honda classified contact structures on lens spaces. A natural question to ask after that is how the transformations on lens spaces interact with the contact structures. In this talk\, we study contactomorphisms on lens spaces\, which are diffeomorphisms preserving the contact structure. We show that the contact mapping class group of a standard contact lens space is a subgroup of the mapping class group of the lens space.
URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-hyunki-min-ucla/
LOCATION:Fletcher 110\, Pitzer College\, 1050 N Mills Ave\, Claremont\, CA\, 91711\, United States
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20231031T150000
DTEND;TZID=America/Los_Angeles:20231031T160000
DTSTAMP:20231030T204415Z
CREATED:20230918T204526Z
LAST-MODIFIED:20231030T204415Z
UID:3246-1698764400-1698768000@colleges.claremont.edu
SUMMARY:Claremont Topology Seminar: Konstantinos Varvarezos (UCLA)
DESCRIPTION:Title: Cosmetic Surgeries on Knots and Heegaard Floer Homology \nAbstract: A common method of constructing 3-manifolds is via Dehn surgery on knots. A pair of surgeries on a knot is called purely cosmetic if the resulting 3-manifolds are homeomorphic as oriented manifolds\, whereas it is said to be chirally cosmetic if they result in homeomorphic manifolds with opposite orientations. An outstanding conjecture predicts that no nontrivial knots admit any purely cosmetic surgeries. We apply certain obstructions from Heegaard Floer homology to show that (nontrivial) knots which arise as the closure of a 3-stranded braid do not admit any purely cosmetic surgeries. Furthermore\, we find new obstructions to the existence of chirally cosmetic surgeries coming from Heegaard Floer homology; in particular\, we make use of immersed curve formulations of knot Floer homology and the corresponding surgery formula. Combining these with other obstructions involving finite type invariants\, we completely classify chirally cosmetic surgeries on odd alternating pretzel knots. Moreover\, we rule out cosmetic surgeries for L-space knots along slopes with opposite signs.
URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-konstantinos-varvarezos-ucla/
LOCATION:Fletcher 110\, Pitzer College\, 1050 N Mills Ave\, Claremont\, CA\, 91711\, United States
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20231024T150000
DTEND;TZID=America/Los_Angeles:20231024T160000
DTSTAMP:20231017T231659Z
CREATED:20230918T204340Z
LAST-MODIFIED:20231017T231659Z
UID:3245-1698159600-1698163200@colleges.claremont.edu
SUMMARY:Claremont Topology Seminar: Wenyuan Li (USC)
DESCRIPTION:Title: Generating families on Lagrangian cobordisms \nAbstract: An important question in contact topology is to understand Legendrian knots and their relations given by Lagrangian cobordisms. In the contact manifold T*M x R\, an important tool to study Legendrian knots and their Lagrangian cobordisms is called generating families or generating functions\, which are generalizations of the defining functions f of graphical Legendrians of the form {(x\, df(x)\, f(x))}. When there exists a generating family with good control at infinity\, interesting Legendrian invariants can be extracted. We try to understand the following basic question: when can a generating function on the Legendrian knot be extended to the Lagrangian cobordism? We will give a necessary and sufficient condition to the problem for generating families with good control at infinity. In particular\, we show that such an extension always exists in the case of Lagrangian concordances.
URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-wenyuan-li-usc/
LOCATION:Fletcher 110\, Pitzer College\, 1050 N Mills Ave\, Claremont\, CA\, 91711\, United States
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20231010T150000
DTEND;TZID=America/Los_Angeles:20231010T160000
DTSTAMP:20231006T052904Z
CREATED:20230915T192038Z
LAST-MODIFIED:20231006T052904Z
UID:3238-1696950000-1696953600@colleges.claremont.edu
SUMMARY:Claremont Topology Seminar: Christopher Perez (Loyola University New Orleans)
DESCRIPTION:Title: Towers and elementary embeddings in total relatively hyperbolic groups \nAbstract: In a remarkable series of papers\, Zlil Sela classified the first-order theories of free groups and torsion-free hyperbolic groups using geometric structures he called towers. It was later proved by Chloé Perin that if H is an elementarily embedded subgroup (or elementary submodel) of a torsion-free hyperbolic group G\, then G is a tower over H. We prove a generalization of Perin’s result to toral relatively hyperbolic groups using JSJ and shortening techniques.
URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-christopher-perez-loyola-university-new-orleans/
LOCATION:Fletcher 110\, Pitzer College\, 1050 N Mills Ave\, Claremont\, CA\, 91711\, United States
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20231003T150000
DTEND;TZID=America/Los_Angeles:20231003T160000
DTSTAMP:20231006T052910Z
CREATED:20231006T052456Z
LAST-MODIFIED:20231006T052910Z
UID:3276-1696345200-1696348800@colleges.claremont.edu
SUMMARY:Claremont Topology Seminar: Julian Chaidez (USC)
DESCRIPTION:Title: Quantum 4-Manifold Invariants Via Trisections \nAbstract: I will describe a new family of potentially non-semisimple invariants for compact a 4-manifold whose boundary is equipped with an open book. The invariant is computed using a trisection\, along with some additional combing data\, and a piece of algebraic data called a Hopf triple. The relationship with other recent works on non-semisimple 4-manifold invariants\, like the work of Costantino-Geer-Patureau-Mirand-Virelizier\, is not yet clear. This talk is based on joint work with Shawn Cui (Purdue) and Jordan Cotler (Harvard).
URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-julian-chaidez-usc/
LOCATION:Fletcher 110\, Pitzer College\, 1050 N Mills Ave\, Claremont\, CA\, 91711\, United States
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20230926T150000
DTEND;TZID=America/Los_Angeles:20230926T160000
DTSTAMP:20230922T154321Z
CREATED:20230922T154321Z
LAST-MODIFIED:20230922T154321Z
UID:3251-1695740400-1695744000@colleges.claremont.edu
SUMMARY:Claremont Topology Seminar: Reginald Anderson (CMC)
DESCRIPTION:Title: Cellular resolutions of the diagonal and exceptional collections for toric Deligne-Mumford stacks (Continued) \nAbstract: Beilinson gave a resolution of the diagonal for complex projective space which yields a strong\, full exceptional collection of line bundles. Bayer-Popescu-Sturmfels generalized Beilinson’s result to a cellular resolution of the diagonal for what they called “unimodular” toric varieties (a more restrictive condition than being smooth)\, which can also be extended to smooth toric varieties and global quotient toric DM stacks of a smooth toric variety by a finite abelian group\, if we allow our resolution to have cokernel which is supported only along the vanishing of the irrelevant ideal. Here we show implications for exceptional collections of line bundles and a positive example for the modified King’s conjecture by giving a strong\, full exceptional collection of line bundles on a smooth\, non-unimodular nef-Fano complete toric surface.
URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-reginald-anderson-cmc-2/
LOCATION:Fletcher 110\, Pitzer College\, 1050 N Mills Ave\, Claremont\, CA\, 91711\, United States
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20230919T150000
DTEND;TZID=America/Los_Angeles:20230919T160000
DTSTAMP:20230918T204921Z
CREATED:20230915T191657Z
LAST-MODIFIED:20230918T204921Z
UID:3237-1695135600-1695139200@colleges.claremont.edu
SUMMARY:Claremont Topology Seminar: Reginald Anderson (CMC)
DESCRIPTION:Title: Cellular resolutions of the diagonal and exceptional collections for toric Deligne-Mumford stacks \nAbstract: Beilinson gave a resolution of the diagonal for complex projective space which yields a strong\, full exceptional collection of line bundles. Bayer-Popescu-Sturmfels generalized Beilinson’s result to a cellular resolution of the diagonal for what they called “unimodular” toric varieties (a more restrictive condition than being smooth)\, which can also be extended to smooth toric varieties and global quotient toric DM stacks of a smooth toric variety by a finite abelian group\, if we allow our resolution to have cokernel which is supported only along the vanishing of the irrelevant ideal. Here we show implications for exceptional collections of line bundles and a positive example for the modified King’s conjecture by giving a strong\, full exceptional collection of line bundles on a smooth\, non-unimodular nef-Fano complete toric surface.
URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-reginald-anderson-cmc/
LOCATION:Fletcher 110\, Pitzer College\, 1050 N Mills Ave\, Claremont\, CA\, 91711\, United States
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20230912T150000
DTEND;TZID=America/Los_Angeles:20230912T160000
DTSTAMP:20231006T053002Z
CREATED:20230913T073733Z
LAST-MODIFIED:20231006T053002Z
UID:3222-1694530800-1694534400@colleges.claremont.edu
SUMMARY:Claremont Topology Seminar: Robert Bowden (HMC)
DESCRIPTION:Title: Chebyshev Threadings in Skein Algebras for Punctured Surfaces \nAbstract: Skein algebras are algebras of links in a surface quotiented by diagram-based equivalence relations based on the Kauffman bracket. In the case of surfaces with punctures\, the skein algebra is generated by links as well as arcs between the punctures\, and there are additional skein relations for the arcs. We examine the algebraic structure of the punctured case\, finding a description of the central elements at certain roots of unity. Our construction is closely related to the one for the usual skein algebra\, where central elements come from threading links by Chebyshev polynomials.
URL:https://colleges.claremont.edu/ccms/event/chebyshev-threadings-in-skein-algebras-for-punctured-surfaces-robert-bowden-hmc/
LOCATION:Fletcher 110\, Pitzer College\, 1050 N Mills Ave\, Claremont\, CA\, 91711\, United States
CATEGORIES:Topology Seminar
ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20220503T150000
DTEND;TZID=America/Los_Angeles:20220503T160000
DTSTAMP:20230913T080534Z
CREATED:20230913T080534Z
LAST-MODIFIED:20230913T080534Z
UID:3232-1651590000-1651593600@colleges.claremont.edu
SUMMARY:On the Non-Orientable 4-Genus of Double Twist Knots\, Part II: Lower Bounds (Jim Hoste\, Pitzer College)
DESCRIPTION:The non-orientable 4-genus of a knot K is the smallest first Betti number of any non-orientable surface in the 4-ball spanning the knot. It is defined to be zero if the knot is slice. In joint work with Patrick Shanahan and Cornelia Van Cott\, we attempt to determine the value of this invariant for double twist knots. In an earlier talk at this seminar\, I presented methods of determining upper bounds by explicitly describing non-orientable spanning surfaces. In this talk I describe methods for establishing lower bounds using linking forms on 4-manifolds and a major result of Donaldson. These methods suffice to compute the non-oprientable 4-genus of several infinite families of double twist knots.
URL:https://colleges.claremont.edu/ccms/event/on-the-non-orientable-4-genus-of-double-twist-knots-part-ii-lower-bounds-jim-hoste-pitzer-college/
LOCATION:Zoom
CATEGORIES:Topology Seminar
ORGANIZER;CN="Sam Nelson":MAILTO:snelson@cmc.edu
END:VEVENT
END:VCALENDAR