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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 continued on Thursdays at the usual time, beginning on 3/18 and ending on 7/15.

The most up-to-date lecture notes will always be posted here. Even though bonus lectures are no longer continuing, the notes will still be updated periodically, although much less regularly.

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, 4/15, 4/22, 4/29, 5/6, 5/20, 5/27, 6/10, 6/17, 6/24, 7/8.