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This is the webpage for my winter 2021 section of Math 128 (homological algebra).

The syllabus is posted here.

Bonus lectures will continue on Thursdays only at the usual time, beginning on Thursday 3/18.

The most up-to-date lecture notes will always be posted here.

As explained in the lecture notes, modifications are temporarily color-coded so that they are easy to spot. In case you fall behind, it may therefore be helpful to look back through the older lecture notes, which are posted here: 1/5, 1/7, 1/12, 1/14, 1/19, 1/21, 1/26, 1/28, 2/2, 2/4, 2/9, 2/11, 2/16, 2/18, 2/23, 2/25, 3/2, 3/4, 3/9, 3/18, 3/25, 4/1.