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November 2021

Applied Math Seminar — Christopher Miles (UC Irvine)

November 15 @ 4:15 pm - 5:15 pm
Emmy Noether Room, Estella 1021, Pomona College, as well as on Zoom, 610 N. College Ave.
Claremont, CA 91711 United States
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Title:  Collective motion in the mitotic spindle Abstract:  Math models of interacting individuals moving as a collective have been profoundly successful in describing physical and social phenomena ranging from swarming insects to human crowds. Especially in molecular biology, recent advances in machine-learning-based automated tracking have led to droves of new data of collective motion. I’ll discuss two related projects, both studying chromosomes (DNA) moving during mitosis (cell division). The first project will hopefully convince you that modeling this system as a collective is…

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On sparse representation of vectors in lattices and semigroups (Iskander Aliev, Cardiff University)

November 16 @ 12:30 pm - 1:20 pm

We will discuss the sparsity of the solutions to systems of linear Diophantine equations with and without non-negativity constraints. The sparsity of a solution vector is the number of its nonzero entries, which is referred to as the 0-norm of the vector. Our main results are new improved bounds on the minimal 0-norm of solutions to systems Ax=b, where A is an integer matrix, b is an integer vector and x is either a general integer vector (lattice case) or…

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Topology Seminar

November 16 @ 3:00 pm - 4:00 pm
|Recurring Event (See all)

An event every week that begins at 3:00 pm on Tuesday, repeating until December 7, 2021

Zoom meeting United States

Collective Behavior in Locust Swarms from Data to Differential Equations (Prof. Jasper Weinburd)

November 17 @ 4:30 pm - 5:45 pm

Title: Collective Behavior in Locust Swarms from Data to Differential Equations   Prof. Jasper Weinburd Department of Mathematics Harvey Mudd College   Abstract: Locusts are devastating pests that infest and destroy crops. Locusts forage and migrate in large swarms which exhibit distinctive shapes that improve efficiency on the group level, a phenomenon known as collective behavior. One of the difficulties in understanding and preventing these collective behaviors has been a lack of biological data for individual interactions between locusts.  In…

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Thanksgiving Week

November 22 @ 4:15 pm - 5:15 pm
Emmy Noether Room, Millikan 1021, Pomona College, 610 N. College Ave.
Claremont, California 91711
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No applied math talk

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Applied Math Seminar – Joan Ponce (UCLA)

November 29 @ 4:15 pm - 5:15 pm
Emmy Noether Room, Estella 1021, Pomona College, as well as on Zoom, 610 N. College Ave.
Claremont, CA 91711 United States
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Title: TBA Abstract: TBA

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Odd subgraphs are odd (Asaf Ferber, UC Irvine)

November 30 @ 12:30 pm - 1:20 pm

In this talk we discuss some problems related to finding large induced subgraphs of a given graph G which satisfy some degree-constraints (for example, all degrees are odd, or all degrees are j mod k, etc). We survey some classical results, present some interesting and challenging problems, and sketch solutions to some of them. This is based on joint works with Michael Krivelevich, and with Liam Hardiman and Michael Krivelevich.

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Topology Seminar

November 30 @ 3:00 pm - 4:00 pm
|Recurring Event (See all)

An event every week that begins at 3:00 pm on Tuesday, repeating until December 7, 2021

Zoom meeting United States

December 2021

A tribute to Professor Ellis Cumberbatch (1934-2021)

December 1 @ 4:30 pm - 6:00 pm

Title: A tribute to Professor Ellis Cumberbatch (1934-2021) Abstract: The math colloquium on December 1st will be devoted to remembrances of our beloved CGU colleague Professor Ellis Cumberbatch, a pillar of the Claremont mathematics community, who passed away in September. Three brief talks by his friends and collaborators, Professor John Ockendon (University of Oxford), Dr. Henok Abebe (Sandia National Labs), and Professor Asuman Aksoy (Claremont McKenna College) will be followed by informal reminiscences by any of the attendees who wish…

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Difference sets in higher dimensions (David Conlon, Cal Tech)

December 7 @ 12:30 pm - 1:20 pm

Let d >= 2 be a natural number. We determine the minimum possible size of the difference set A-A in terms of |A| for any sufficiently large finite subset A of R^d that is not contained in a translate of a hyperplane. By a construction of Stanchescu, this is best possible and thus resolves an old question first raised by Uhrin. Joint work with Jeck Lim.

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