# Past Events

### Marc Levine

University of Duisburg-EssenEquivariant localization in quadratic enumerative geometry

June 20, 2022

We explain how to adapt the classical Atiyah-Bott torus localization methods to the computation of invariants, such as degrees of Euler classes, in the Grothendieck-Witt ring of quadratic forms, These quadratic enumerative invariants lift the usual integer-valued ones via the rank function, and... Read more

- Intercontinental Moduli and Algebraic Geometry Seminar

### Benjamin Antieau

Northwestern UniversityThe K-theory of Z/p^n

June 15, 2022

I will report on joint work with Achim Krause and Thomas Nikolaus where we give an algorithm to compute the K-groups of rings such as Z/p^n. Read more

- Algebra and Algebraic geometry

### Eliahu Matzri

Bar Ilan UniversiyOn the symbol length in Galois cohomology.

June 8, 2022

Fix a prime p and let F be a field with characteristic not p. Let G_F be the absolute Galois group of F and let \mu_{p^s} be the G_F-module of roots of unity of order dividing p^s in a fixed algebraic closure of F. Let \alpha \in H^n(F,\mu_{p^s}^{\otimes n}) be a symbol (i.e \alpha=a_1 U ... U... Read more

### Aravind Asok

University of Southern CaliforniaOn P^1-stabilization in unstable motivic homotopy theory

June 1, 2022

I will discuss joint work with Tom Bachmann and Mike Hopkins regarding an analog of the Freudenthal suspension theorem in unstable motivic homotopy theory. To motivate the result, I will quickly introduce the unstable motivic homotopy category and discuss some concrete applications. Time... Read more

- Algebra and Algebraic geometry

### Caroline Colijn

SFUNiven Lecture: Genomic Epidemiology in SARS-CoV-2: new models and challenges

May 31, 2022

UBC Mathematics Building, Room 100

Scientists around the world have sequenced over 2 million SARS-CoV-2 genomes in an effort to monitor and understand the evolution and transmission of this virus. Virus sequences can help us understand the emergence of new variants with new phenotypes, track the virus' geographical movements and... Read more

### Ruixiang Zhang

UC BerkeleyA stationary set method for estimating oscillatory integrals

May 19, 2022

https://ubc.zoom.us/j/68361900578?pwd=UkNHUzZMMkZoT0VJOFlVSWhDR0gzQT09

Given a polynomial $P$ of constant degree in $d$ variables and consider the oscillatory integral $$I_P = \int_{[0,1]^d} e(P(\xi)) \mathrm{d}\xi.$$ Assuming $d$ is also fixed, what is a good upper bound of $|I_P|$? In this talk, I will introduce a ``stationary set'' method that gives an upper... Read more

- Harmonic Analysis and Fractal Geometry

### Luca Ciandrini

U. MonpellierModelling mRNA translation: from the individual transcript to the impact on cellular physiology

May 18, 2022

Zoom - contact Katie Faulkner for link

One of the greatest challenges in biophysical models of translation is to identify coding sequence features that affect the rate of translation and therefore the overall protein production or the cellular growth rate.

I will first introduce a power series method to solve a translation... Read more

- Mathematical Biology

### Yumeng Ou

University of PennsylvaniaUnit distance type problems for point configurations in fractal sets

May 12, 2022

https://ubc.zoom.us/j/62198385847?pwd=ZWRTTGdQazU5cTE4bXlnK3duNGpBQT09

Abstract: The unit distance problem in discrete geometry studies the maximum number of times the unit distance can be achieved in a given point set. In 2015, D. Oberlin and R. Oberlin formulated an analogue of this problem in the continuous setting. In this talk, I'll discuss the problem and... Read more

- Harmonic Analysis and Fractal Geometry

### Navid Nabijou

CambridgeFrom orbifolds to logarithms via birational invariance

May 9, 2022

Logarithmic and orbifold structures provide two different paths to the enumeration of curves with fixed tangencies to a normal crossings divisor. Simple examples demonstrate that the resulting systems of invariants differ, but a more structural explanation of this defect has remained elusive. I... Read more

- Intercontinental Moduli and Algebraic Geometry Seminar

### Nidhi Kaihnsa

Brown UniversityMultistationarity and Robustness in Reaction Networks

May 6, 2022

online

In biochemical reactions, the interaction between species is represented by directed graphs and their dynamics over time is modelled with ordinary differential equations. In this talk I will discuss recent results on two key dynamical properties of steady states of chemical reaction networks:... Read more