Question

A weird construction transforming a semigroup with action to just semigroup

score 48 · Answer 1 · 2026-03-25 12:53:03

48

Views

A weird construction transforming a semigroup with action to just semigroup

Published on 25 Mar 2026 - 12:53

score 25 · Answer 2 · 2026-03-25 03:07:17

25

Views

Does $B(BE\dot{\cup} E)\subset BE\dot{\cup} E$ imply that $B$ is a sub-semigroup?

Published on 25 Mar 2026 - 3:07

score 71 · Answer 3 · 2026-03-26 12:07:08

71

Views

Term for $eSe$ where $S$ is a semigroup and $e \in S$ is an idempotent

Published on 26 Mar 2026 - 12:07

score 63 · Answer 4 · 2023-08-24 09:53:35

63

Views

polynomial composition - semigroup turn into group

Published on 24 Aug 2023 - 9:53

score 133 · Answer 5 · 2023-09-14 16:38:19

133

Views

Semigroup could be a group?

Published on 14 Sep 2023 - 16:38

score 85 · Answer 6 · 2023-09-20 15:41:00

85

Views

What are the names for the following “anti-ideal”-like properties?

Published on 20 Sep 2023 - 15:41

score 51 · Answer 7 · 2023-09-26 21:15:22

51

Views

Injective object in category $\mathcal{K}$, which has an object $a$ and $\text{Hom}(a,a) = S $ is a semigroup with unit.

Published on 26 Sep 2023 - 21:15

score 93 · Answer 8 · 2026-03-26 17:32:38

93

Views

Faithful representations of the bicyclic semigroup (bicyclic monoid)

Published on 26 Mar 2026 - 17:32

score 43 · Answer 9 · 2026-03-26 06:28:36

43

Views

How to calculate the trace of a semigroup?

Published on 26 Mar 2026 - 6:28

score 108 · Answer 10 · 2023-10-10 14:24:33

108

Views

Balakrishnan identity

Published on 10 Oct 2023 - 14:24

score 50 · Answer 11 · 2026-03-26 19:02:02

50

Views

Is the free monoid on $n$ generators just the semigroup on $n$ generators adjoined with an identity element?

Published on 26 Mar 2026 - 19:02

score 39 · Answer 12 · 2023-10-12 12:28:05

39

Views

Prove that $\bigcup_{i=k}^{k+m-1} R^i$ is idempotent, where $k,m$ are the index and period of $R$.

Published on 12 Oct 2023 - 12:28

score 723 · Answer 13 · 2023-10-16 22:30:29

723

Views

Sets closed on addition

Published on 16 Oct 2023 - 22:30

score 126 · Answer 14 · 2023-11-12 23:06:49

126

Views

What is the name for inverse semigroups that have "unique factorisation of products"?

Published on 12 Nov 2023 - 23:06

score 64 · Answer 15 · 2026-03-16 18:18:14

64

Views

How many functions from $\mathbb{N}\cup\{0\}$ to $\mathbb{N}\cup\{0\}$ have $\phi(ab) = \phi(a) + \phi(b)$?

Published on 16 Mar 2026 - 18:18

List Question

A weird construction transforming a semigroup with action to just semigroup

Does $B(BE\dot{\cup} E)\subset BE\dot{\cup} E$ imply that $B$ is a sub-semigroup?

Term for $eSe$ where $S$ is a semigroup and $e \in S$ is an idempotent

polynomial composition - semigroup turn into group

Semigroup could be a group?

What are the names for the following “anti-ideal”-like properties?

Injective object in category $\mathcal{K}$, which has an object $a$ and $\text{Hom}(a,a) = S $ is a semigroup with unit.

Faithful representations of the bicyclic semigroup (bicyclic monoid)

How to calculate the trace of a semigroup?

Balakrishnan identity

Is the free monoid on $n$ generators just the semigroup on $n$ generators adjoined with an identity element?

Prove that $\bigcup_{i=k}^{k+m-1} R^i$ is idempotent, where $k,m$ are the index and period of $R$.

Sets closed on addition

What is the name for inverse semigroups that have "unique factorisation of products"?

How many functions from $\mathbb{N}\cup\{0\}$ to $\mathbb{N}\cup\{0\}$ have $\phi(ab) = \phi(a) + \phi(b)$?

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