Commutative algebra 46: Limits and colimits of modules
Channel: Richard E Borcherds
Date: 2020-11-04

This lecture is part of an online course on commutative algebra, following the book
"Commutative algebra with a view toward algebraic geometry" by David Eisenbud.

We define limits and colimits of modules, and give several examples (direct sums and products, kernels, cokernels, inverse limits, unions,...)
We give an example to show that taking the colimit of a functor is not always quite the same as taking a colimit over a subcategory. 

Reading: Section
Exercises: