BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Claremont Center for the Mathematical Sciences - ECPv6.15.17.1//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-ORIGINAL-URL:https://colleges.claremont.edu/ccms X-WR-CALDESC:Events for Claremont Center for the Mathematical Sciences REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:America/Los_Angeles BEGIN:DAYLIGHT TZOFFSETFROM:-0800 TZOFFSETTO:-0700 TZNAME:PDT DTSTART:20240310T100000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0700 TZOFFSETTO:-0800 TZNAME:PST DTSTART:20241103T090000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0800 TZOFFSETTO:-0700 TZNAME:PDT DTSTART:20250309T100000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0700 TZOFFSETTO:-0800 TZNAME:PST DTSTART:20251102T090000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0800 TZOFFSETTO:-0700 TZNAME:PDT DTSTART:20260308T100000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0700 TZOFFSETTO:-0800 TZNAME:PST DTSTART:20261101T090000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250301T100000 DTEND;TZID=America/Los_Angeles:20250301T120000 DTSTAMP:20260606T135451 CREATED:20250206T020957Z LAST-MODIFIED:20250206T020957Z UID:3687-1740823200-1740830400@colleges.claremont.edu SUMMARY:GEMS March 1st Session DESCRIPTION:This GEMS session will be facilitated by Professor Jemma Lorenat from Pitzer College.\n\n\nTitle: Playing with the Rules of Geometries\n\nAbstract:  This session will explore how a small set of rules can be used to build and investigate geometrical objects. Through drawing\, folding\, and imagining\, we will see how a limited number of possible actions ground a wide range of mathematical creations. URL:https://colleges.claremont.edu/ccms/event/gems-march-1st-session/ LOCATION:Shanahan 1480\, Harvey Mudd College\, 301 Platt Blvd.\, Claremont\, CA\, 91711\, United States CATEGORIES:GEMS END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250302T121500 DTEND;TZID=America/Los_Angeles:20250304T131000 DTSTAMP:20260606T135451 CREATED:20250302T201628Z LAST-MODIFIED:20250302T201628Z UID:3716-1740917700-1741093800@colleges.claremont.edu SUMMARY:Enumerative Invariants from Derived Categories III (Reginald Anderson\, CMC) DESCRIPTION:We’ll first define the two-point gravitational correlators which appeared last week as descendant Gromov-Witten invariants. By request\, we’ll then introduce Gromov-Witten invariants as they appear in the expository work https://arxiv.org/abs/2501.03232 and give CP^1 to demonstrate some of the identities which GW invariants satisfy. If time allows\, we’ll also give the small and big quantum cohomology for CP^1. URL:https://colleges.claremont.edu/ccms/event/enumerative-invariants-from-derived-categories-iii-reginald-anderson-cmc/ LOCATION:Estella 2113 CATEGORIES:Algebra / Number Theory / Combinatorics Seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250303T161500 DTEND;TZID=America/Los_Angeles:20250303T171500 DTSTAMP:20260606T135451 CREATED:20250130T002829Z LAST-MODIFIED:20250225T061553Z UID:3666-1741018500-1741022100@colleges.claremont.edu SUMMARY:Applied Math Seminar: Efstratios Tsoukanis (Claremont Graduate University) DESCRIPTION:Title: Bi-Lipschitz Invariants \nAbstract: Consider a finite-dimensional real vector space and a finite group acting unitarily on it. We investigate the general problem of constructing Euclidean stable embeddings of the quotient space of orbits. Our embedding relies on subsets of sorted coorbits with respect to chosen window vectors. Our main injectivity results examine the conditions under which such embeddings are injective. We establish these results using semialgebraic techniques. Furthermore\, our main stability result states and demonstrates that any embedding based on sorted coorbits is automatically bi-Lipschitz when injective. We establish this result using geometric function techniques. Our work has applications in data science\, where certain systems exhibit intrinsic invariance to group actions. For instance\, in graph deep learning\, graph-level regression and classification models must be invariant to node labeling. URL:https://colleges.claremont.edu/ccms/event/applied-math-seminar-efstratios-tsoukanis-claremont-graduate-university/ LOCATION:Emmy Noether Room\, Estella 1021\, Pomona College\,\, 610 N. College Ave.\, Claremont\, CA\, 91711\, United States CATEGORIES:Applied Math Seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250304T150000 DTEND;TZID=America/Los_Angeles:20250304T160000 DTSTAMP:20260606T135451 CREATED:20250214T211058Z LAST-MODIFIED:20250227T210413Z UID:3702-1741100400-1741104000@colleges.claremont.edu SUMMARY:Claremont Topology Seminar: Carrie Frizzell (Scripps College) DESCRIPTION:We especially welcome all undergraduates and graduate students to attend topology seminar! \nSpeaker: Carrie Frizzell (Scripps College) \nTitle: A Primer on Tropical Geometry \nAbstract: Max-plus and min-plus semifields—coined tropical semifields—appeared in the 1970s in the work of the computer scientist Imre Simon. Since then\, the field of tropical geometry has developed rapidly. In this talk\, we’ll present some basics of tropical geometry\, starting with tropical algebra and then passing to the geometric side via a few examples of tropical hypersurfaces. We will also discuss the relationship between classical algebraic curves and tropical curves. \n  URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-carrie-frizzell-scripps-college/ LOCATION:Estella 2099\, Pomona College\, 610 N. College Ave.\, Claremont\, CA\, United States CATEGORIES:Topology Seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250305T161500 DTEND;TZID=America/Los_Angeles:20250305T173000 DTSTAMP:20260606T135451 CREATED:20250125T042805Z LAST-MODIFIED:20250303T182848Z UID:3645-1741191300-1741195800@colleges.claremont.edu SUMMARY:No CCMS Colloquium! DESCRIPTION: URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-tba-3/ LOCATION:Argue Auditorium\, Pomona College\, 610 N. College Ave.\, Claremont\, CA\, 91711\, United States CATEGORIES:Colloquium ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu GEO:34.0999157;-117.7142668 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Argue Auditorium Pomona College 610 N. College Ave. Claremont CA 91711 United States;X-APPLE-RADIUS=500;X-TITLE=610 N. College Ave.:geo:-117.7142668,34.0999157 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250308T080000 DTEND;TZID=America/Los_Angeles:20250308T170000 DTSTAMP:20260606T135451 CREATED:20250212T183309Z LAST-MODIFIED:20250212T183631Z UID:3694-1741420800-1741453200@colleges.claremont.edu SUMMARY:N+12th Southern California Topology Colloquium DESCRIPTION:The Claremont Topology Seminar\, with funding from Pitzer College and the NSF\, is pleased to sponsor the N+12th Southern California Topology Colloquium (SCTC). SCTC is a one-day conference primarily attended by mathematicians from the Southern California area. This year\, the colloquium will be held at the Benson Auditorium at Pitzer College on \nSaturday\, March 8th\, 2025. \nAll talks will take place in Benson Auditorium on the Pitzer College campus. Light breakfast\, lunch\, coffee and snacks will be served in the foyer of Benson Auditorium. The speakers are \nDror Bar-Natan\, University of Toronto \nPatrick Orson\, California Polytechnic State University\, San Luis Obispo \nRhea Palak Bakshi\, University of California\, Santa Barbara \nSucharit Sarkar\, University of California\, Los Angeles \nThere is no registration fee\, but you must register to attend. More information can be found at the SCTC website below: \nhttps://sites.google.com/view/socaltopology/home   \n  \nContact SCTC 2025 organizers for more questions: \nBahar Acu\, \, Pitzer College\, Claremont Colleges \nKo Honda\, \, University of California\, Los Angeles \nYi Ni\, \, California Institute of Technology \nHelen Wong\, \, Claremont McKenna College\, Claremont Colleges \n  URL:https://colleges.claremont.edu/ccms/event/n12th-southern-california-topology-colloquium/ LOCATION:Benson Auditorium\, 1050 N Mills Ave.\, Claremont\, CA\, 91711\, United States CATEGORIES:Special Event,Topology Seminar ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250310T161500 DTEND;TZID=America/Los_Angeles:20250310T171500 DTSTAMP:20260606T135451 CREATED:20250130T002924Z LAST-MODIFIED:20250303T200907Z UID:3668-1741623300-1741626900@colleges.claremont.edu SUMMARY:Applied Math Seminar: Sarah Robinson (Claremont McKenna College) DESCRIPTION:Title: Do Taxes Affect Pre-Tax Income Inequality? Evidence from 100 Years of U.S. States \nAbstract: We study how U.S. state taxes have affected pre-tax income inequality during the last century. Our primary analysis focuses on the top marginal personal income and corporate income tax\, and their effect on top incomes and top income shares within each state. The long panel nature of our data\, from 1917 to 2018\, allows us to study the effect of tax adoptions\, tax cancellations\, and tax changes\, and furthermore to assess both immediate and long-term relationships. With event study and synthetic control designs\, we generally find no statistically significant relationship between tax measures and inequality. Some of our point estimates\, as well as a simple two-way fixed effects analysis\, suggest that higher income taxes may reduce top incomes and income shares. URL:https://colleges.claremont.edu/ccms/event/applied-math-seminar-sarah-robinson-claremont-mckenna-college/ LOCATION:Emmy Noether Room\, Estella 1021\, Pomona College\,\, 610 N. College Ave.\, Claremont\, CA\, 91711\, United States CATEGORIES:Applied Math Seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250311T150000 DTEND;TZID=America/Los_Angeles:20250311T160000 DTSTAMP:20260606T135451 CREATED:20250214T211215Z LAST-MODIFIED:20250303T222536Z UID:3703-1741705200-1741708800@colleges.claremont.edu SUMMARY:Claremont Topology Seminar: Iris Yoon (Wesleyan University) DESCRIPTION:We especially welcome all undergraduates and graduate students to attend topology seminar! \nSpeaker: Iris Yoon (Wesleyan University) \nTitle: Dowker duality\, profunctors\, and spectral sequences \nAbstract: I will present three short\, new proofs of Dowker duality using various poset fiber lemmas. I will introduce modifications of joins and products of simplicial complexes called relational join and relational product complexes. These relational complexes can be constructed whenever there is a relation between simplicial complexes\, which includes the context of Dowker duality and covers of simplicial complexes. In this more general setting\, I will show that the homologies of the simplicial complexes and the relational complexes fit together in a long exact sequence. If time permits\, I’ll discuss similar results for profunctors\, which are generalizations of relations to categories. URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-iris-yoon-wesleyan-university/ LOCATION:Estella 2099\, Pomona College\, 610 N. College Ave.\, Claremont\, CA\, United States CATEGORIES:Topology Seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250312T161500 DTEND;TZID=America/Los_Angeles:20250312T173000 DTSTAMP:20260606T135451 CREATED:20250125T043428Z LAST-MODIFIED:20250303T183823Z UID:3646-1741796100-1741800600@colleges.claremont.edu SUMMARY:CCMS Colloquium: (Iris Yoon\, Wesleyan University) DESCRIPTION:Speaker: Iris Yoon\, Professor of Mathematics\, Wesleyan University \nTitle: How Topology Reveals Structure in Neuroscience Data \nAbstract: We live in an exciting time where new data is generated at an exponential rate. Such data explosion necessitates the development of novel methods for studying large\, noisy\, and complex data. One interesting aspect of data is its shape and structure. In this talk\, I will discuss recent developments in applied topology that studies the structure of data. In particular\, I will show how constructions in topology\, such as homology and Dowker complexes\, reveal interesting structures in data. I will discuss the mathematical challenges of extending these constructions to data science\, specifically in neuroscience. \nBio: Iris Yoon is an assistant professor of mathematics at Wesleyan University. She develops novel applications of algebraic topology to data science. \n  URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-iris-yoon-wesleyan-university/ LOCATION:Argue Auditorium\, Pomona College\, 610 N. College Ave.\, Claremont\, CA\, 91711\, United States CATEGORIES:Colloquium ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu GEO:34.0999157;-117.7142668 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Argue Auditorium Pomona College 610 N. College Ave. Claremont CA 91711 United States;X-APPLE-RADIUS=500;X-TITLE=610 N. College Ave.:geo:-117.7142668,34.0999157 END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250318T080000 DTEND;TZID=America/Los_Angeles:20250318T170000 DTSTAMP:20260606T135451 CREATED:20250214T211316Z LAST-MODIFIED:20250214T211316Z UID:3704-1742284800-1742317200@colleges.claremont.edu SUMMARY:Claremont Topology Seminar: NO SEMINAR DESCRIPTION:No seminar this week due to Spring break! URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-no-seminar/ LOCATION:CA CATEGORIES:Topology Seminar END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20250319 DTEND;VALUE=DATE:20250320 DTSTAMP:20260606T135451 CREATED:20250131T234805Z LAST-MODIFIED:20250131T234805Z UID:3675-1742342400-1742428799@colleges.claremont.edu SUMMARY:No Colloquium: Spring Break DESCRIPTION: URL:https://colleges.claremont.edu/ccms/event/no-colloquium-spring-break/ LOCATION:CA CATEGORIES:Colloquium END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250324T161500 DTEND;TZID=America/Los_Angeles:20250324T171500 DTSTAMP:20260606T135451 CREATED:20250130T190206Z LAST-MODIFIED:20250311T055012Z UID:3672-1742832900-1742836500@colleges.claremont.edu SUMMARY:Applied Math Seminar: Ryan O'Dowd (Claremont Graduate University) DESCRIPTION:Title: Learning on manifolds without manifold learning \nAbstract: Function approximation based on data drawn randomly from an unknown distribution is an important problem in machine learning. The manifold hypothesis assumes that the data is sampled from an unknown submanifold of a high dimensional Euclidean space. A great deal of research deals with obtaining information about this manifold\, such as the eigendecomposition of the Laplace-Beltrami operator or coordinate charts\, and using this information for function approximation. This two-step approach implies some extra errors in the approximation stemming from estimating the basic quantities of the data manifold in addition to the errors inherent in function approximation. In this paper\, we project the unknown manifold as a submanifold of an ambient hypersphere and study the question of constructing a one-shot approximation using a specially designed sequence of localized spherical polynomial kernels on the hypersphere. Our approach does not require preprocessing of the data to obtain information about the manifold other than its dimension. We give optimal rates of approximation for relatively “rough” functions. URL:https://colleges.claremont.edu/ccms/event/applied-math-seminar-ryan-odowd-claremont-graduate-university/ LOCATION:Emmy Noether Room\, Estella 1021\, Pomona College\,\, 610 N. College Ave.\, Claremont\, CA\, 91711\, United States CATEGORIES:Applied Math Seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250325T121500 DTEND;TZID=America/Los_Angeles:20250325T131000 DTSTAMP:20260606T135451 CREATED:20250127T201036Z LAST-MODIFIED:20250324T151237Z UID:3659-1742904900-1742908200@colleges.claremont.edu SUMMARY:Some Diophantine analogies between Dirichlet series and polynomials (Vesselin Dimitrov\, Caltech) DESCRIPTION:I will present an integral — requiring no character twists — converse theorem for recognizing when is a Dirichlet series with algebraic integer coefficients equal to the L-function of a modular form. This refines the unbounded denominators conjecture of Atkin and Swinnerton-Dyer. Analogies with basic function field arithmetic then suggest a quantitative refinement which precludes a pair of GL(2) automorphic L-functions with closely matched up zeros. I will explain how to get at such a theorem.  URL:https://colleges.claremont.edu/ccms/event/antc-talk-vesselin-dimitrov-caltech/ LOCATION:Estella 2113 CATEGORIES:Algebra / Number Theory / Combinatorics Seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250325T150000 DTEND;TZID=America/Los_Angeles:20250325T160000 DTSTAMP:20260606T135451 CREATED:20250214T211453Z LAST-MODIFIED:20250324T000533Z UID:3705-1742914800-1742918400@colleges.claremont.edu SUMMARY:Claremont Topology Seminar: Reginald Anderson (Claremont McKenna College) DESCRIPTION:We especially welcome all undergraduates and graduate students to attend topology seminar! \nSpeaker: Reginald Anderson (Claremont McKenna College) \nTitle: Kontsevich’s Recursive Formula for Rational Plane Curves \nAbstract: Gromov-Witten theory was developed in the 1990s as a curve-counting theory by integrating cohomology classes against a virtual fundamental class for a moduli space of stable maps. One early success of the theory was Kontsevich’s recursive formula for enumerating the number of rational plane curves through 3d-1 points in general position. Starting from a consideration of which genus 0 Gromov-Witten invariants for the complex projective plane can possibly be non-zero\, we will assemble a generating function for these invariants\, called the genus 0 Gromov-Witten potential for the complex projective plane. If time allows\, we will also use the fact that the potential satisfies a partial differential equation called the Witten-Dijkgraaf-Verlinde-Verlinde equation to solve for N_d\, the coefficients of the generating function\, which give the number of rational plane curves through 3d-1 points. \nThis talk follows p. 24-26 of these notes\, available at https://arxiv.org/abs/2501.03232. \nAll are welcome. URL:https://colleges.claremont.edu/ccms/event/claremont-topology-seminar-reginald-anderson-claremont-mckenna-college/ LOCATION:Estella 2099\, Pomona College\, 610 N. College Ave.\, Claremont\, CA\, United States CATEGORIES:Topology Seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20250326T161500 DTEND;TZID=America/Los_Angeles:20250326T173000 DTSTAMP:20260606T135451 CREATED:20250201T220938Z LAST-MODIFIED:20250326T201510Z UID:3681-1743005700-1743010200@colleges.claremont.edu SUMMARY:CCMS Colloquium: Brownian Motion\, Random Fractals\, and Beyond (Yimin Xiao\, Michigan State Uni) DESCRIPTION:Speaker: Yimin Xiao\, Professor of Statistics and Probability\, Michigan State University \nTitle: Brownian Motion\, Random Fractals\, and Beyond \nAbstract: Brownian motion is not only a fascinating object in mathematics but also a powerful stochastic model that has been applied in many scientific fields\, from physics to finance\, to biological sciences. The sample function of Brownian motion is nowhere differentiable and generates various interesting fractal sets and measures. It is natural to apply tools from Fractal Geometry (e.g. Hausdorf dimension\, packing dimension) to study the fine properties of Brownian motion. There is an enormous literature on sample path properties of Brownian motion\, including many fractal and multifractal properties.\nIn this talk\, we first provide an overview of some regularity and fractal properties of Brownian motion and its local times. These results are fundamental for the development of related theories for other stochastic processes. We then describe extensions of these results to Levy stable processes and fractional Brownian motion\, which are two important relatives of Brownian motion in the areas of Markov processes and Gaussian processes\, respectively. \nBio: Yimin Xiao is an MSU Research Foundation Professor in Statistics and Probability at Michigan State University. He received his Ph.D. from the Ohio State University in 1996. After completing his postdocs at the University of Utah and Microsoft Research\, he joined Michigan State University in 2000. His research interests include random fields\, Gaussian and Lévy processes\, stochastic partial differential equations\, extreme value theory\, random fractals\, and statistical analysis of spatial and spatio-temporal models. He has published about 160 articles in peer-reviewed journals. \nDr. Xiao has been a visiting professor at several universities in China\, France\, Germany\, Hong Kong\, Sweden\, and Switzerland and has been invited as a speaker at various international conferences. He is a Fellow of the Institute of Mathematical Statistics. \n  URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-brownian-motion-random-fractals-and-beyond-yimin-xiao-michigan-state-uni/ LOCATION:Argue Auditorium\, Pomona College\, 610 N. College Ave.\, Claremont\, CA\, 91711\, United States CATEGORIES:Colloquium ORGANIZER;CN="Bahar Acu":MAILTO:Bahar_Acu@pitzer.edu GEO:34.0999157;-117.7142668 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Argue Auditorium Pomona College 610 N. College Ave. Claremont CA 91711 United States;X-APPLE-RADIUS=500;X-TITLE=610 N. College Ave.:geo:-117.7142668,34.0999157 END:VEVENT END:VCALENDAR