Schemes 45: Blowing up schemes
Channel: Richard E Borcherds
Date: 2020-08-14

This lecture is part of an online algebraic geometry course on schemes, based on chapter II of "Algebraic geometry" by Hartshorne.

In this lecture we discuss the operation of blowing up a scheme along a sheaf of ideals. This can be used to make ideals invertible, and to eliminate points of indeterminacy of rational maps.