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Line 71: valuation ring ''R'' with residue field ''K'' of positive characteristic ''p'' and field of fractions ''F'' of characteristic ''0'', such as the [[p-adic integers]]. The structure of ''R''[''G''] is closely related both to the structure of the group algebra ''K''[''G''] and to the structure of the semisimple group algebra ''F''[''G''], and there is much interplay between the module theory of the three algebras.

Modular representation theory: Difference between revisions