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On equality of indices.

R.K.S. Rathore, H.L. Manocha (1973)

Publications de l'Institut Mathématique [Elektronische Ressource]

On non-Hopfian groups of fractions

Olga Macedońska (2017)

Open Mathematics

The group of fractions of a semigroup S, if exists, can be written as G = SS−1. If S is abelian, then G must be abelian. We say that a semigroup identity is transferable if being satisfied in S it must be satisfied in G = SS−1. One of problems posed by G.Bergman in 1981 asks whether the group G must satisfy every semigroup identity which is satisfied in S, that is whether every semigroup identity is transferable. The first non-transferable identities were constructed in 2005 by S.V.Ivanov and A.M....

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