Review of étale cohomology

Abstract: Topic: A crash course on étale cohomology covering étale morphisms, sites and cohomology, and the étale site.

References: Poonen, Rational points on varieties, Sections 3.5 (just enough to define étale morphism) and 6.1-6.4; or Milne, Lectures on étale cohomology.

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.

Fall 2025 topic: Weil conjectures.

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.