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X-WR-CALDESC:Events for Claremont Center for the Mathematical Sciences
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DTSTART;TZID=America/Los_Angeles:20190213T161500
DTEND;TZID=America/Los_Angeles:20190213T171500
DTSTAMP:20190213T234043Z
CREATED:20190110T154812Z
LAST-MODIFIED:20190213T234043Z
UID:10001662-1550074500-1550078100@colleges.claremont.edu
SUMMARY:Cracking the Code: Predicting Properties of Material Fracture Networks using Machine Learning (Allon Percus\, CGU)
DESCRIPTION:Understanding how fluid flows through heterogeneous materials\, and how it can make these materials fail\, are among the hardest challenges in materials science.  Experiments and simulations show that flow through subsurface rock is mostly limited to a small subnetwork\, or backbone\, of fractures.  Identifying this backbone would allow for a large speedup in flow and transport simulations\, but the process of identifying it can itself be computationally intensive.  I will discuss a machine learning approach\, developed in a CGU Math Clinic project with Los Alamos National Laboratory\, that rapidly finds relevant subnetworks based on graph structure and training data from simulations.  Time permitting\, I will also describe a method that uses graph convolutional neural networks to predict\, with high accuracy\, how fractures grow in brittle materials.  This provides an automated approach for learning how the fractures can radiate through the material\, and ultimately cause it to fail.
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-allon-percus-cgu/
LOCATION:Shanahan B460\, Harvey Mudd College\, 301 Platt Blvd.\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Ali Nadim":MAILTO:ali.nadim@cgu.edu
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DTSTART;TZID=America/Los_Angeles:20190206T161500
DTEND;TZID=America/Los_Angeles:20190206T171500
DTSTAMP:20190214T061816Z
CREATED:20190110T154612Z
LAST-MODIFIED:20190214T061816Z
UID:10001660-1549469700-1549473300@colleges.claremont.edu
SUMMARY:Algebraic and Polyhedral Perspectives on Combinatorial Neural Codes (Robert Davis\, Harvey Mudd)
DESCRIPTION:In the 1970s\, James O’Keefe and his team observed that certain neurons in the brain\, called place cells\, spike in their firing rates when the animal is in a particular physical location within its arena. If a place cell is thought of as either “active” or “silent\,” then one may represent the co-firing patterns of place cells by a combinatorial neural code: a set of 0/1 vectors whose coordinates represent that status of distinct place cells. From the code\, we can try to reconstruct a geometric picture of the neural activity by sketching a disjoint union of simple closed curves in the plane. Ideally\, each curve corresponds to a unique place cell and the interiors of the curves are convex. However\, this is not always possible\, and identifying criteria which makes this possible is a difficult problem. \nIn this talk\, we will discuss approaches to the problem of representing combinatorial neural codes using convex sets. We will see how turning the codewords into polynomials can reveal hidden information about the code\, and how this naturally leads to examining properties of related polyhedra. In particular\, we will present progress on using polyhedra to identify representability of a code with circles in the plane.
URL:https://colleges.claremont.edu/ccms/event/ccms-colloquium-robert-davis-harvey-mudd/
LOCATION:Shanahan B460\, Harvey Mudd College\, 301 Platt Blvd.\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Ali Nadim":MAILTO:ali.nadim@cgu.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20190130T161500
DTEND;TZID=America/Los_Angeles:20190130T171500
DTSTAMP:20190123T163658Z
CREATED:20190110T154412Z
LAST-MODIFIED:20190123T163658Z
UID:10001658-1548864900-1548868500@colleges.claremont.edu
SUMMARY:Mathematics: Pure\, Applied\, A Liberal Art ( Al Erisman\, Seattle Pacific University)
DESCRIPTION:From the view of a pure mathematician\, those working in pure mathematics produce pure knowledge. Whether used or not\, it has a great elegance and value in and of itself. Those in applied mathematics simply pick up what has been done and use it in designing or building things. Number theory is often used to illustrate this\, where work done decades ago in pure mathematics is now central to encryption. \nHowever\, the relationship between pure and applied mathematics is a bit more complicated. New insights drawn from applications have been at the root of interesting new areas and questions in pure mathematics. Fourier analysis\, sparse matrix computation\, and graph theory all demonstrate this. \nSome have argued that\, whether pure or applied\, mathematics is not really needed by the average person. Alfred North Whitehead\, a Harvard mathematician and philosopher\, once stated\, “ideas [from mathematics] are of highly specialized application\, and rarely influence thought.” In other words\, mathematics is a specialized skill\, but not a liberal art. \nUsing examples from n-dimensional linear algebra\, I will show why I believe the areas of pure and applied mathematics are deeply tied\, and that this field does indeed influence thought in areas like understanding relationships and political discourse.
URL:https://colleges.claremont.edu/ccms/event/mathematics-pure-applied-a-liberal-art-al-erisman-seattle-pacific-university/
LOCATION:Shanahan B460\, Harvey Mudd College\, 301 Platt Blvd.\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium
ORGANIZER;CN="Ali Nadim":MAILTO:ali.nadim@cgu.edu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20190123T161500
DTEND;TZID=America/Los_Angeles:20190123T171500
DTSTAMP:20200114T161552Z
CREATED:20190115T082247Z
LAST-MODIFIED:20200114T161552Z
UID:10001551-1548260100-1548263700@colleges.claremont.edu
SUMMARY:CCMS Field Committee Meeting
DESCRIPTION:The Field Committee Meeting is our chance to socialize with our colleagues and coordinate our course offerings for the coming academic year (2019-2020).\n\nPlease come to discuss course offerings and other synergistic items.\n\nRefreshments at 4:00\, meeting at 4:15.
URL:https://colleges.claremont.edu/ccms/event/ccms-field-committee-meeting/
LOCATION:Shanahan B460\, Harvey Mudd College\, 301 Platt Blvd.\, Claremont\, CA\, 91711\, United States
CATEGORIES:Colloquium,Special Event
ORGANIZER;CN="Andrew Bernoff":MAILTO:ajb@hmc.edu
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