Past Events

E.g., Jun 2, 2025

Paige Bright

UBC
Continuum Beck-Type Problems

October 23, 2024

ESB 4133 (PIMS Library)

Radial projections have been a quickly developing topic in harmonic analysis. The work of Orponen-Shmerkin-Wang connected this topic to a continuum Beck theorem for lines, finding a (lower) bound for the dimension of lines that contain at least two points in a given subset of $\mathbb{R}^n$.... Read more

  • Harmonic Analysis and Fractal Geometry

Johannes Baeumler

UCLA
A (dis)continuous percolation phase transition on the hierarchical lattice

October 23, 2024

For long-range percolation on $\mathbb{Z}$ with translation-invariant edge kernel $J$, it is a classical theorem of Aizenman and Newman (1986) that the phase transition is discontinuous when $J(x-y)$ is of order $|x-y|^{-2}$ and that there is no phase transition at all when $J(x-y)=o(|x-y|^{-2... Read more

  • Probability

Davide Cusseddu

Universidade do Minho
Math-Bio: A discussion on mathematical modelling with fractional derivatives with a focus on a SIS epidemiological model.

October 23, 2024

ESB4133 & Online

Due to their nonlocal properties, fractional derivatives, such as the Riemann-Liouville or Caputo type, are sometimes used to model memory effects. While their physical interpretation is still not clear, fractional models seem to better describe experimental data, as compared to classical ones.... Read more

  • Mathematical Biology

Sujatha Ramdorai

UBC
Growth of Mordell-Weil ranks of elliptic curves

October 21, 2024

Math 126, Dept. of Mathematics, UBC

Let E be an elliptic curve over a number field F. We will discuss the structure of certain modules that arise in the Iwasawa theory of elliptic curves and their applications to the growth of Mordell-Weil ranks along infinite Galois extensions of F with noncommutative Galois groups. Read more

  • Algebra and Algebraic geometry

Naoki Koseki

University of Liverpool
Gopakumar-Vafa invariants of local curves

October 21, 2024

In the 1990s, two physisists, Gopakumar and Vafa, proposed an ideal way to count curves in a Calabi-Yau threefold, that is conjecturally equivalent to other curve counting theories such as Gromov-Witten theory. It is very recent that Maulik and Toda gave a mathematically rigorous definition of... Read more

  • Intercontinental Moduli and Algebraic Geometry Seminar

Robert McCann

University of Toronto
Free boundary regularity for the monopolist's problem: an excursion into the economic value of private information

October 18, 2024

ESB 2012 and Zoom

The principal-agent problem is an important paradigm in economic theory for studying the value of private information; the nonlinear pricing problem faced by a monopolist is one example; others include optimal taxation and auction design. For multidimensional spaces of consumers (i.e. agents)... Read more

Lucas Villagra Torcomian

SFU
Endomorphism algebras of {\rm GL}_2-type abelian varieties and Diophantine applications

October 18, 2024

UBC

Let f and g be two newforms with equal coefficient fields. In this talk we will see how a congruence between the Galois representations of f and g for a sufficiently large prime p implies strong conditions between the algebras of endomorphisms of the abelian varieties associated to the newforms... Read more

  • Number Theory

Giuseppe Genovese

UBC
Patter retrieval in the Hopfield model

October 16, 2024

Hopfield proposed in 1982 as a simple model capable to store and successively retrieve a number of high dimensional patterns, which represents nowadays a cornerstone of the early AI studies. The Hopfield model can be studied from the angle of statistical mechanics and spin glasses. It is... Read more

  • Probability

Dr. Nilima Nigam

SFU
Math-Bio: Skeletal muscle: modeling and computation

October 16, 2024

ESB4133

Skeletal muscle is composed of cells collectively referred to as fibers, which themselves contain contractile proteins arranged longtitudinally into sarcomeres. These latter respond to signals from the nervous system, and contract; unlike cardiac muscle, skeletal muscles can respond to voluntary... Read more

  • Mathematical Biology

Hong Wang

NYU. (Host: J. Zahl)
Survey on incidence estimates for tubes

October 11, 2024

ESB 2012 and Zoom

Given a set T of distinct \delta-tubes and a set P of disjoint \delta-balls in R^n, the set of incidences between T and P is defined as $I (P, T) = \{ (p, l)\in P\times T: p\cap l \neq \emptyset \}$. The well-known Szemeredi-Trotter theorem in combinatorics studies a discrete analogue, the... Read more