# Events for 03/18/2019 from all calendars

## Number Theory Seminar

**Time:** 3:00PM - 4:00PM

**Location:** BLOC 220

**Speaker:** Laura DeMarco, Northwestern University

**Title:** *Heights on P^1 and unlikely intersections*

**Abstract:** I will discuss uniformity questions surrounding Unlikely Intersection problems -- the most famous of which is the Manin-Mumford Conjecture (proved by Raynaud, 1983) -- and a new result about elliptic curves and the geometry of their torsion points, joint with Holly Krieger and Hexi Ye. Our results hold over C, the field of complex numbers, but the proofs are carried out first over the field of algebraic numbers (and involve an analysis of certain height functions on P^1). Our strategy is based on equidistribution results for dynamical systems on P^1. **Joint with Groups and Dynamics Seminar.**

**URL:** *Link*

## Frontiers in Mathematics Lecture Series

**Time:** 4:00PM - 5:00PM

**Location:** Blocker 117

**Speaker:** Rupert Klein, Freie Universität Berlin

**Title:** *Scales in Weather and Climate*

**Abstract:** The science of weather and climate is challenging for many reasons, one being the *multiscale nature* of atmosphere-ocean flows. In this lecture I will first explain the notion of *scales* in this context through concrete examples, such as tropical hurricanes or the desertification of the Sahara some 8000 years ago. I will move on to discuss how mathematical formalization and solution techniques allow us to systematically unravel many, but far from all, of the underlying physical processes. An outline of remaining major challenges at the forefront of today’s weather and climate research will reveal that substantial progress can be expected only through intense interdisciplinary research involving the natural sciences as much as mathematics and computer science.