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Generalised E-Algebras Over Valuation Domains, Brendan Goldsmith, P. Zanardo
Generalised E-Algebras Over Valuation Domains, Brendan Goldsmith, P. Zanardo
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Let R be a valuation domain. We investigate the notions of E(R)- algebra and generalized E(R)-algebra and show that for wide classes of maximal valuation domains R, all generalized E(R)-algebras have rank one. As a by-product we prove if R is a maximal valuation domain of finite Krull dimension, then the two notions coincide. We give some examples of E(R)-algebras of finite rank that are decomposable, but show that over Nagata domains of small degree, the E(R)-algebras are, with one exception, the indecomposable finite rank algebras.