# Changes

## Group cohomology of Klein four-group

, 15:17, 21 July 2011
Cohomology ring with coefficients in integers
{{fillin}}
==Cohomology groups and cohomology ring with coefficients in integers==
===Groups over the integers=== The cohomology groups with coefficients in the integers are given as below: [itex]H^p(\mathbb{Z}/2\mathbb{Z} \oplus \mathbb{Z}/2\mathbb{fillinZ};\mathbb{Z}) = [/itex]
==Second cohomology groups and extensions==