denote the chain homotopy equivalence associated with the Kunneth .
Given and we define
As and are chain maps, induces a well defined product on cohomology groups, known as the cup product. Hence the direct sum of the cohomology groups of has the structure of a ring. This is called the cohomology ring of .
|Date of creation||2013-03-22 15:37:42|
|Last modified on||2013-03-22 15:37:42|
|Last modified by||whm22 (2009)|