List questions from inverse-semigroups

Published on 07 Mar 2026 - 11:11

210

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Involution on inverse semigroups

Published on 07 Mar 2026 - 11:08

1.1k

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Example of an inverse semigroup

Published on 07 Mar 2026 - 11:12

358

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A reflective subcategory of the category of inverse semigroups.

Published on 24 Mar 2026 - 0:16

41

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Semilattice of idempotent

Published on 06 Dec 2019 - 11:50

294

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Existence of a commutative inverse semigroup with no identity element

Published on 20 Dec 2019 - 6:45

326

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example of monoids

Published on 22 Mar 2026 - 3:13

42

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Characters on inverse semigroups: Hahn-Banach?

Published on 15 Jun 2020 - 12:22

92

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Ways of describing/classifying a strange structure where $a\ast a = b; b\ast b = a; a\ast b = a$

Published on 07 Mar 2026 - 11:11

123

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Prove the following characterization for inverse semigroups

Published on 07 Mar 2026 - 11:09

179

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Example of a locally inverse semigroup which isn't a generalized inverse semigroup

Published on 23 Feb 2026 - 8:33

98

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In the symmetric inverse semigroup, $I_X$, if $|X| = n$, show that $|I_X| = \sum_{r=0}^n \begin{pmatrix} n\\ r\end{pmatrix}^2 r!$

Published on 05 Jan 2017 - 1:12

86

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Help with understanding the "upper saturation/closure" of a subset of an inverse Semigroup.

Published on 05 Jan 2017 - 2:00

95

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Is this semigroup a group?

Published on 12 Jan 2017 - 17:56

45

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Is multiplication by a fixed element an open map in a topological semigroup?

Published on 12 Mar 2023 - 20:28

List Question

$C^*$-algebra norm computations

Involution on inverse semigroups

Example of an inverse semigroup

A reflective subcategory of the category of inverse semigroups.

Semilattice of idempotent

Existence of a commutative inverse semigroup with no identity element

example of monoids

Characters on inverse semigroups: Hahn-Banach?

Ways of describing/classifying a strange structure where $a\ast a = b; b\ast b = a; a\ast b = a$

Prove the following characterization for inverse semigroups

Example of a locally inverse semigroup which isn't a generalized inverse semigroup

In the symmetric inverse semigroup, $I_X$, if $|X| = n$, show that $|I_X| = \sum_{r=0}^n \begin{pmatrix} n\\ r\end{pmatrix}^2 r!$

Help with understanding the "upper saturation/closure" of a subset of an inverse Semigroup.

Is this semigroup a group?

Is multiplication by a fixed element an open map in a topological semigroup?

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