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cohomology ring

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cohomology

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Similar to the discussion at cohomology group, a cohomology set H (X,A)H^\bullet(X,A) may have the structure of a ring if the coefficient object AA suitably does.

In particular for H=L whe\mathbf{H} = L_{whe}Top, then H *(X,A)H^*(X,A) is a ring when AA is an E E_\infty-ring.

Revised on March 13, 2014 07:41:57 by Urs Schreiber (88.128.80.11)