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Semigroup algebras of finite ample semigroups

  • Xiaojiang Guo (a1) and Lin Chen (a1)

Abstract

An adequate semigroup S is called ample if ea = a(ea)* and ae = (ae)a for all aS and eE(S). Inverse semigroups are exactly those ample semigroups that are regular. After obtaining some characterizations of finite ample semigroups, it is proved that semigroup algebras of finite ample semigroups have generalized triangular matrix representations. As applications, the structure of the radicals of semigroup algebras of finite ample semigroups is obtained. In particular, it is determined when semigroup algebras of finite ample semigroup are semiprimitive.

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