Constructible sheaves

Abstract: Constructible sheaves are built from locally constant sheaves and serve as the coefficients for étale cohomology. We will discuss the motivation behind their definition, examples and some basic properties.

Reference: Jannsen, Deligne's proof of the Weil-conjecture (course notes), Section 2.

algebraic geometrynumber theory

Audience: advanced learners

STAGE

Series comments: STAGE (Seminar on Topics in Arithmetic, Geometry, Etc.) is a learning seminar in algebraic geometry and number theory, featuring speakers talking about work that is not their own. Talks will be at a level suitable for graduate students. Everyone is welcome.

Spring 2026 topic: The descent obstruction.

Some topics might take more or less time than allotted. If a speaker runs out of time on a certain date, that speaker might be allowed to borrow some time on the next date. So the topics below might not line up exactly with the dates below.