## Math Calendar

Monday, December 9, 2019

15:30-16:30

BBG069

Master thesis defense

Mireia Martínez I Sellarès - From Logic to Mathematical Logic; on the History of Logic in the 19th Century

see description

You are allcordially invited to the presentation of my master's thesis, titled'From Logic to Mathematical Logic: on the History of Logic in the 19thCentury' and written under the supervision of dr. Gerard Alberts (UvA). My UU-supervisor is dr. Viktor Blåsjö and my second readeris dr. Jaap van Oosten.

Mathematical logic was born in the nineteenth century,according to the standard narrative. This birth has commonly been explained asan instance of emergence, marked by the publication in 1879 of Gottlob Frege's Begriffsschrift.This narrative was established in the 1960s and has since been criticized by anumber of authors. In this talk we will outline this standard narrative,explain some of its weak points, and show the evidence presented against them.We will then suggest an alternative interpretation which describes the changesin nineteenth century logic as four threads or lines of transformation.

No knowledge of present-day mathematical logic is required.

Mathematical logic was born in the nineteenth century,according to the standard narrative. This birth has commonly been explained asan instance of emergence, marked by the publication in 1879 of Gottlob Frege's Begriffsschrift.This narrative was established in the 1960s and has since been criticized by anumber of authors. In this talk we will outline this standard narrative,explain some of its weak points, and show the evidence presented against them.We will then suggest an alternative interpretation which describes the changesin nineteenth century logic as four threads or lines of transformation.

No knowledge of present-day mathematical logic is required.

Tuesday, December 10, 2019

16:00-17:00

MIN 014

Utrecht Geometry Center Seminar

Masha Vlasenko (Polish Academy of Sciences) - Hodge structures and differential operators

see description

Classical methods allow one to construct solutions of a linear

differential equation near a regular singularity using power series

and the logarithm function. In the talk I will explain the link

between these classical solutions and the limiting mixed Hodge

structure defined in 1970's by Deligne and Schmid.

I will then speak about higher Apéry's constants discovered recently

by Golyshev and Zagier. In a joint work with Spencer Bloch we apply

the idea from the first part of this talk to study these numbers.

differential equation near a regular singularity using power series

and the logarithm function. In the talk I will explain the link

between these classical solutions and the limiting mixed Hodge

structure defined in 1970's by Deligne and Schmid.

I will then speak about higher Apéry's constants discovered recently

by Golyshev and Zagier. In a joint work with Spencer Bloch we apply

the idea from the first part of this talk to study these numbers.

Thursday, December 12, 2019

15:30-16:30

KBG Pangea

The Utrecht Mathematical Colloquium

Chris Budd (University of Bath) - Non-smooth models in the Geosciences

see description

In this talk Iwill show how models of both geology and climate lead tonon-smooth dynamical systems. I will show how the theory of such systemscan then be used to help explain such diverse problems as rockfolding and the behaviour of the ice ages.

Tuesday, December 17, 2019

Thursday, December 19, 2019

14:00-15:00

Drift 25

Tuesday, January 7, 2020

16:00-17:00

MIN 014

Thursday, January 9, 2020

16:00-17:00

Tuesday, January 14, 2020

16:00-17:00

MIN 014

Utrecht Geometry Center Seminar

Ivan Beschastnyi (Sorbonne) - Symplectic methods in optimisation problems

see description

Abstract: The goal of this talk will be to convince the audience that the language of symplectic geometry is the most natural language for the study of minimisation problems. We will revise some basic tools from classical calculus of variations such as the Lagrange multiplier rule and Jacobi fields, explain their symplectic meaning and how those notions can be extended to a much more general setting.

Thursday, January 16, 2020

16:00-17:00

Tuesday, January 21, 2020

Thursday, January 23, 2020

16:00-17:00

Tuesday, January 28, 2020

16:00-17:00

MIN 014

Thursday, January 30, 2020

15:30-16:30

MIN 201

The Utrecht Mathematical Colloquium

Lior Bary-Soroker (Tel Aviv) - Virtually all polynomials are irreducible

see description

Abstract: It has been known for almost a hundred years that most polynomials with large integral coefficients are irreducible and have a big Galois group. For a few dozen years, people have been interested in whether the same holds when one considers families of polynomials with small coefficients—notably, polynomials with plus-minus 1 coefficients. In particular, “some guy on the street” conjectures that the probability for a random plus-minus 1 coefficient polynomial to be irreducible tends to 1 as the degree tends to infinity (a much earlier conjecture of Odlyzko-Poonen is about the 0-1 coefficients model). In the talk, I will discuss these types of problems, and approach to attack them using combination of combinatorics, analytic number theory, random permutations, and number theory in function fields.

Tuesday, February 4, 2020

16:00-17:00

MIN 014

Thursday, February 6, 2020

16:00-17:00

Applied Mathematics Seminar

Jeremy Budd (TU Delft) - Allen-Cahn and MBO on graphs, HFG 611

see description

Title: Allen-Cahn and MBO on graphs

Abstract: An emerging technique in clustering, segmentation and classification problems is to consider the dynamics of flows defined on finite graphs. In particular Bertozzi and co-authors considered dynamics related to Allen-Cahn flow (Bertozzi, Flenner, 2012) and the MBO algorithm (Merkurjev, Kostic, Bertozzi, 2013) for this purpose.

This talk will exhibit our recent work showing rigorous links between these two flows, explaining why MBO can be used as an alternative to Allen-Cahn.

Abstract: An emerging technique in clustering, segmentation and classification problems is to consider the dynamics of flows defined on finite graphs. In particular Bertozzi and co-authors considered dynamics related to Allen-Cahn flow (Bertozzi, Flenner, 2012) and the MBO algorithm (Merkurjev, Kostic, Bertozzi, 2013) for this purpose.

This talk will exhibit our recent work showing rigorous links between these two flows, explaining why MBO can be used as an alternative to Allen-Cahn.

Tuesday, February 11, 2020

Thursday, February 13, 2020

Tuesday, February 18, 2020

16:00-17:00

MIN 014

Thursday, February 20, 2020

16:00-17:00

Tuesday, February 25, 2020

Thursday, February 27, 2020

16:00-17:00

Tuesday, March 3, 2020

Thursday, March 5, 2020

Tuesday, March 10, 2020

Tuesday, March 17, 2020

Thursday, March 19, 2020

Tuesday, March 24, 2020

Thursday, March 26, 2020

Tuesday, March 31, 2020

Tuesday, April 7, 2020

Tuesday, April 14, 2020

Thursday, April 16, 2020

16:00-17:00

Tuesday, April 21, 2020

Tuesday, April 28, 2020

Tuesday, May 5, 2020

Tuesday, May 12, 2020

Tuesday, May 19, 2020

Tuesday, May 26, 2020

Tuesday, June 2, 2020