Introduzione


Abstract


En
The aim of this work is to present,in a sufficiently complete manner,the theory of idempotent semigroups.The results here exposed are essentially due to Mc Lean,Kimura,Petrich,Warne,Green,Rees, Gerhardt,Yamada,Fennemore.Examples are provided and open problems indicated.

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کاغذ a4

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