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Results tagged with cup-product
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user 24021
5
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Defining the cup product in Ext using a Kunneth formula
I want to make a Kunneth product of sorts on Ext. In particular, letting $C_*$ be a $R$-free resolution for $k$ over a $k$-hopf algebra $R$, elements in $Ext_R(k,k)$ are represented by maps in $Hom_R …
- 1,147
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Why are cup-i products and Steenrod Squares often (always?) unary?
One way to define the Steenrod Operations is to use the cup-i product, as in Mosher and Tangora's book. It basically says, given the chain complex from mod-2 homology $C_\ast$, define
$D_0 : C_\ast\ …
- 1,147