Commutative semigroups


[Thanks to Alar Leibak, aleibak@ioc.ee, for helping to construct this pa ge]

Definition

Semigroups + xy = yx

Examples

Structure

Representation

Decision problems

Identity problem:
Word problem:

Spectra and growth

Finite spectrum:
Free spectrum:
Growth series:

History/Importance

References

Subsystems


    A Catalogue of Algebraic Systems / John Pedersen / jfp@math.usf.edu