Norman R. Reilly
Abstract
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In [1], Theorem 2.2, a necessary and sufficient condition is given for a subset of an inverse semigroup to generate a free inverse subsemigroup. However one very obvious further condition is omitted. The result should read as follows.
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In [1], Theorem 2.2, a necessary and sufficient condition is given for a subset of an inverse semigroup to generate a free inverse subsemigroup. However one very obvious further condition is omitted. The result should read as follows.
Key concepts: Mathematics, Inverse semigroup, Inverse, Inverse element, Semigroup, Pure mathematics, Discrete mathematics, Special classes of semigroups