List questions from finite-semigroups

Published on 25 Apr 2017 - 13:36

58

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Idempotent endomorphism on finite monogenic monoid onto its subgroup

Published on 08 Mar 2026 - 9:12

83

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A question on Finite Semigroup

Published on 19 Mar 2026 - 16:57

372

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How many non-isomorphic semigroups are there of orders $2$ and $3$?

Published on 20 Mar 2026 - 22:17

123

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A question about a semigroup with two elements

Published on 08 Nov 2017 - 14:49

315

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Subsemigroup generated by an element contains unique idempotent

Published on 26 Sep 2011 - 20:54

114

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In a finite semigroup, does each ideal (esp. the minimal ideal) have an idempotent?

Published on 14 Dec 2020 - 10:18

132

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Is any finite semigroup of this type a left monoid?

Published on 22 Dec 2020 - 18:42

537

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Let $(S,*)$ be a finite semigroup with identity. Prove that $S$ is a group iff $S$ has only one element $x$ such that $x^2=x$.

Published on 18 Jan 2021 - 22:32

506

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Showing star-freeness of recursively defined languages

Published on 24 Apr 2021 - 17:20

126

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The rank of a semigroup

Published on 20 May 2021 - 12:24

55

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Rank of the finite semigroup

Published on 06 Jun 2021 - 18:25

117

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Finite Semigroups property

Published on 07 Jun 2021 - 6:57

79

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When do $2\times2$ matrices generate a finite semigroup?

Published on 21 Jan 2022 - 16:44

45

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On the rank of finite semigroups

Published on 11 Feb 2022 - 12:10

List Question

Necessary condition for left simple semigroup with an idempotent

Idempotent endomorphism on finite monogenic monoid onto its subgroup

A question on Finite Semigroup

How many non-isomorphic semigroups are there of orders $2$ and $3$?

A question about a semigroup with two elements

Subsemigroup generated by an element contains unique idempotent

In a finite semigroup, does each ideal (esp. the minimal ideal) have an idempotent?

Is any finite semigroup of this type a left monoid?

Let $(S,*)$ be a finite semigroup with identity. Prove that $S$ is a group iff $S$ has only one element $x$ such that $x^2=x$.

Showing star-freeness of recursively defined languages

The rank of a semigroup

Rank of the finite semigroup

Finite Semigroups property

When do $2\times2$ matrices generate a finite semigroup?

On the rank of finite semigroups

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