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Jun 27, 2022 at 0:43 vote accept Nanjun Yang
Jun 24, 2022 at 4:16 comment added Eric Peterson $d_2$ is described by a “secondary” cohomology operation. You can read quite a bit about it in May’s A general algebraic approach to Steenrod operations (whose title I may be imperfectly remembering), where the relevant operation is called $\beta_2$.
Jun 23, 2022 at 12:22 history became hot network question
Jun 23, 2022 at 10:24 answer added IJL timeline score: 7
Jun 23, 2022 at 2:40 history edited Nanjun Yang CC BY-SA 4.0
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Jun 23, 2022 at 2:34 history asked Nanjun Yang CC BY-SA 4.0