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→Defect groups: define notation |
→Reduction (mod p): Example of an appropriate ring, and fix italics |
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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'']
between the module theory of the three algebras.
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