Papers › Enumerating Transformation Semigroups
Enumerating Transformation Semigroups
James East, Attila Egri-Nagy, James D. Mitchell
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We describe general methods for enumerating subsemigroups of finite semigroups and techniques to improve the algorithmic efficiency of the calculations. As a particular application we use our algorithms to enumerate all transformation semigroups up to degree 4. Classification of these semigroups up to conjugacy, isomorphism and anti-isomorphism, by size and rank, provides a solid base for further investigations of transformation semigroups.
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