Dear Colleagues and Students,
You are cordially invited to the Topology Seminar organized by the Department of Mathematics.
Speaker: Alex Degtyarev (Bilkent)
“Lines generate the Picard group of a Fermat surface”
Abstract: I will explain a purely topological solution of a long standing algebra-geometric problem, viz. the so-called Shioda conjecture. After a brief introduction to the subject, I will state the problem and reduce it to the computation of the fundamental group (or, rather, properly understood Alexander module) of a certain arrangement of lines in the plane. Then, in the bulk of the talk, I will try to explain this computation in detail: We will discuss the braid monodromy, Zariski–van Kampen theorem (with its pros and contras) computing the fundamental group of a plane curve, and, essentially, Fox’ free calculus explained via cellular complexes.
The talk will largely be accessible to graduate and senior undergraduate students. At the end of the talk I am planning to discuss the generalizations to the so-called Delsarte surfaces and state a few open problems that may constitute a master or Ph.D. project.
Date: Monday, November 25, 2019
Place: Mathematics Seminar Room, SA – 141