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References to 'monoid'
1. $\epsilon$-transition by CWoo
2. additive function by Wkbj79
3. adjoining an identity to a semigroup by mclase
4. automaton over a monoid by CWoo
5. bicyclic semigroup by mclase
6. Cayley's theorem for semigroups by Ziosilvio
7. characteristic monoid by CWoo
8. characterization of free submonoids by Ziosilvio
9. characterization of prime ideals by GrafZahl
10. commutative semigroup by mclase
11. concatenation by CWoo
12. divisor theory by pahio
13. divisors in base field and finite extension field by pahio
14. equivalent regular expressions by CWoo
15. examples of semigroups by CWoo
16. fractional ideal by djao
17. free group by yark
18. free product with amalgamated subgroup by mathcam
19. free semigroup by yark
20. free semigroup with involution by Mazzu
21. free submonoid by Ziosilvio
22. graded algebra by mhale
23. group cohomology by alozano
24. heap by CWoo
25. I-semigroup by Mazzu
26. idempotency by yark
27. identity element by mclase
28. identity element is unique by pahio
29. If $A$ and $B$ commute so do $A$ and $B^{-1}$ by mathcam
30. image ideal of divisor by pahio
31. Jacobson radical by yark
32. Kleene star by CWoo
33. Kleene's theorem by CWoo
34. matrix characterizations of automata by CWoo
35. mixed group by CWoo
36. multiplicative function by Wkbj79
37. Myhill-Nerode theorem for semigroups by Ziosilvio
38. natural number by djao
39. nth root by mathcam
40. one-sided normality of subsemigroup by lars_h
41. operations on relations by CWoo
42. presentation of inverse monoids and inverse semigroups by Mazzu
43. quantale by CWoo
44. rational set by CWoo
45. residuated lattice by CWoo
46. rig by HkBst
47. Sch\"{u}tzenberger graph by Mazzu
48. semigroup with involution by Mazzu
49. semiring by mps
50. strict divisibility by pahio
51. subsemigroup of a cyclic semigroup by CWoo
52. syntactic congruence by Ziosilvio
53. Thue system by CWoo
54. Wagner congruence by Mazzu
55. word problem by Mazzu