List questions from semigroups

Published on 26 Mar 2026 - 12:42

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Axiomatic formal language theory

Published on 17 Oct 2017 - 14:12

192

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Intersection of subgroup of $\mathbb{Z}^{d}$ with $\mathbb{N}^{d}$ is a finitely generated monoid?

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81

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order of subsemigroups

Published on 22 Oct 2017 - 4:13

2.5k

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List of common semigroups (which are not groups)?

Published on 29 Oct 2017 - 2:59

32

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separable in topology of $E$

Published on 03 Nov 2017 - 8:26

43

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countable generated left ideal

Published on 03 Nov 2017 - 21:30

79

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Right ideal of idempotent is subsemigroup of regular semigroup?

Published on 04 Nov 2017 - 23:08

1.2k

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Testing for associativity using the multiplication table (Cayley Table) of an operation.

Published on 26 Mar 2026 - 12:46

124

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A question about a semigroup with two elements

Published on 25 Mar 2026 - 6:09

38

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Show that $S=X^X$ is a semigroup

Published on 12 Nov 2017 - 14:38

105

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Does this specific proof of Hindman's theorem actually require full choice?

Published on 27 Mar 2026 - 23:13

724

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Probs. 12 & 13 , Sec. 2.3, in Herstein's TOPICS IN ALGEBRA, 2nd ed: Existence of only right-sided identity and right-sided inverses suffice

Published on 22 Nov 2017 - 8:16

152

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Successive application of binary operation to set of n-tuples produces a semigroup.

Published on 28 Nov 2017 - 15:09

141

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Functions on a cover with the property $f(U \cap V) = f(U)\,f(V)$

Published on 04 Dec 2017 - 4:55

List Question

Prove generalized associative law

Axiomatic formal language theory

Intersection of subgroup of $\mathbb{Z}^{d}$ with $\mathbb{N}^{d}$ is a finitely generated monoid?

order of subsemigroups

List of common semigroups (which are not groups)?

separable in topology of $E$

countable generated left ideal

Right ideal of idempotent is subsemigroup of regular semigroup?

Testing for associativity using the multiplication table (Cayley Table) of an operation.

A question about a semigroup with two elements

Show that $S=X^X$ is a semigroup

Does this specific proof of Hindman's theorem actually require full choice?

Probs. 12 & 13 , Sec. 2.3, in Herstein's TOPICS IN ALGEBRA, 2nd ed: Existence of only right-sided identity and right-sided inverses suffice

Successive application of binary operation to set of n-tuples produces a semigroup.

Functions on a cover with the property $f(U \cap V) = f(U)\,f(V)$

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