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[leblon]

The cup product in the simplicial cochain complex is supercommutative modulo terms depending on a "derived" product of degree -1. That new product is anti-supercommutative modulo terms depending on a product of degree -2. Et cetera. The formula for the cup product is in every textbook on algebraic topology. The formula for the degree -1 product is in a 1947 paper by Steenrod in Ann. Math. He defines all higher products, but does not give an explicit formula for them. Anybody knows an explicit formula for the degree -2 product?

Comments

[jedal]

В статье http://arxiv.org/abs/math/0106024 на стр. 2-3 есть предельно явные формулы.

[leblon.livejournal.com]

Спасибо!

[leblon.livejournal.com]

Wait, there are no signs on pp. 2-3. I see that they are defined later, and they are pretty ugly.