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Published online by Cambridge University Press: 22 January 2016
For convenience we consider throughout an arbitrary but fixed multiplicative group H. The integral group ring of H is denoted by ZH, and the homomorphism ε: ZH→Z is always the trivializer, or unit augmentation, defined by εh = 1 for all h ∈ H.
This work was supported by a grant (G-8931) from the National Science Foundation.