Solutions and Elaborations for Weibel's "Homological Algebra"
Some notes I wrote in grad school while working through the text. I recommend only using them if you're really stuck: there may be errors, and writing solutions tends to be more educational than reading them. Last updated 1/19/17.
Injective Modules are Algebraically Closed
Injective modules are important critters in homological algebra with an (in my view) un-intuitive definition. These are notes about a slightly more concrete take on what it means to be an injective module.