Schemes 4: f * and f^ 1
Channel: Richard E Borcherds
Date: 2020-07-05

This lecture is part of an online algebraic geometry course on schemes, based on chapter II of "Algebraic geometry" by Hartshorne.
Given a continuous map between topological spaces there are two natural ways to transfer sheaves from one space to another. We summarize the main properties of them: they are adjoint to each other, one is left exact, and the other is exact.