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References to 'subsemigroup,, submonoid,, and subgroup'
1. adjoining an identity to a semigroup by mclase
2. Cayley's theorem for semigroups by Ziosilvio
3. centralizer of a k-cycle by rm50
4. characteristic monoid by CWoo
5. characterization of free submonoids by Ziosilvio
6. characterization of prime ideals by GrafZahl
7. cyclic semigroup by mclase
8. examples of semigroups by CWoo
9. free submonoid by Ziosilvio
10. graded ring by aplant
11. one-sided normality of subsemigroup by lars_h
12. ordered group by pahio
13. Parikh's theorem by CWoo
14. rational set by CWoo
15. regular semigroup by yark
16. semigroup of transformations by mclase
17. semilattice decomposition of a semigroup by mclase
18. stabilizer by djao
19. subgroup by Daume
20. subsemigroup of a cyclic semigroup by CWoo
21. symmetric inverse semigroup by Mazzu
22. valuation determined by valuation domain by pahio