Any finite semigroup is a divisor for an alternating wreath product of finite groups and semigroups.
Krohn-Rhodes Theorem
See also
Krohn-Rhodes Complexity, Krohn-Rhodes Theory, Wreath ProductExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Krohn-Rhodes Theorem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Krohn-RhodesTheorem.html