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Results tagged with group-rings
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user 4760
A group ring $R[G]$ is a ring constructed in a natural way from a ring $R$ and a group $G$.
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votes
Do the homological dimension and cohomological dimension for a group agree?
The cohomological and homological dimension of a group do not agree in general. For example, the homological dimension of the group $Z[\frac{1}{2}]$ is one, while its cohomological dimension is 2. Ho …
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