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when toggle format what by license comment
Sep 10, 2020 at 8:33 history edited YCor CC BY-SA 4.0
slightly expanded title (and put math 'a')
Sep 10, 2020 at 6:45 history edited YCor
edited tags
Sep 10, 2020 at 6:12 answer added Achim Krause timeline score: 3
Sep 10, 2020 at 4:49 comment added A_Physicist. @QiaochuYuan I added an explicit expression. You are right, the cup product of two 2-cocycles is a 4-cocycle. The $\cup_1$ product of two 2-cocycles is a 3-cochain.
Sep 10, 2020 at 4:47 history edited A_Physicist. CC BY-SA 4.0
added 137 characters in body
Sep 10, 2020 at 3:11 comment added Qiaochu Yuan What is $\cup_1$ here? Is it the cup product? Isn't the cup product of two $2$-cocycles a $4$-cocycle?
Sep 9, 2020 at 23:25 history asked A_Physicist. CC BY-SA 4.0