Question

What's a semidirect product of semigroups?

score 567 · Answer 1 · 2014-10-22 13:49:59

567

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What's a semidirect product of semigroups?

Published on 22 Oct 2014 - 13:49

score 570 · Answer 2 · 2014-10-28 04:17:34

570

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Partition of $\mathbb{R}^+$ into two semigroups

Published on 28 Oct 2014 - 4:17

score 6.2k · Answer 3 · 2014-11-15 12:19:48

6.2k

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A finite semi-group with cancellation laws is a group .

Published on 15 Nov 2014 - 12:19

score 1.1k · Answer 4 · 2026-02-23 04:52:41

1.1k

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Just How Strong is Associativity?

Published on 23 Feb 2026 - 4:52

score 108 · Answer 5 · 2014-11-16 16:29:45

108

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On prime ideals in semigroups

Published on 16 Nov 2014 - 16:29

score 46 · Answer 6 · 2014-11-19 11:01:57

46

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$A_1,A_2,A_3$ forms a partition of $\mathbb N_{>0}$ and $a,b,c \in A_i \implies a+b+c \in A_i$ then at-least one of $A_i$ is closed under addition?

Published on 19 Nov 2014 - 11:01

score 785 · Answer 7 · 2014-11-23 15:26:47

785

Views

Is this a*b = a is semigroup and commutative?

Published on 23 Nov 2014 - 15:26

score 149 · Answer 8 · 2026-03-25 16:02:19

149

Views

Subsets of a monoid closed under left-multiplication by elements of a submonoid

Published on 25 Mar 2026 - 16:02

score 39 · Answer 9 · 2014-12-03 02:04:19

39

Views

Can we define unitary representations on semigroups

Published on 03 Dec 2014 - 2:04

score 2.3k · Answer 10 · 2014-12-05 19:26:29

2.3k

Views

Example of an associative binary operation, without identities or inverses.

Published on 05 Dec 2014 - 19:26

score 144 · Answer 11 · 2014-12-06 00:03:51

144

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Can a smooth function on the reals form a non-commutative semigroup?

Published on 06 Dec 2014 - 0:03

score 60 · Answer 12 · 2014-12-07 19:48:27

60

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Non-unital commutative semigroups $S$ such that for all $x \in S$, the function $S \rightarrow S$ given by $y \mapsto x+y$ is a bijection?

Published on 07 Dec 2014 - 19:48

score 85 · Answer 13 · 2014-12-08 10:55:02

85

Views

About a semigroup equipped by zero

Published on 08 Dec 2014 - 10:55

score 228 · Answer 14 · 2014-12-21 10:39:26

228

Views

Proving that if the semigroup (A, *) is a group, then the relation is an equivalence relation.

Published on 21 Dec 2014 - 10:39

score 529 · Answer 15 · 2014-12-23 16:04:25

529

Views

Proving that the binary operator of a group is commutative if the relation on the group is a partial order

Published on 23 Dec 2014 - 16:04

List Question

What's a semidirect product of semigroups?

Partition of $\mathbb{R}^+$ into two semigroups

A finite semi-group with cancellation laws is a group .

Just How Strong is Associativity?

On prime ideals in semigroups

$A_1,A_2,A_3$ forms a partition of $\mathbb N_{>0}$ and $a,b,c \in A_i \implies a+b+c \in A_i$ then at-least one of $A_i$ is closed under addition?

Is this a*b = a is semigroup and commutative?

Subsets of a monoid closed under left-multiplication by elements of a submonoid

Can we define unitary representations on semigroups

Example of an associative binary operation, without identities or inverses.

Can a smooth function on the reals form a non-commutative semigroup?

Non-unital commutative semigroups $S$ such that for all $x \in S$, the function $S \rightarrow S$ given by $y \mapsto x+y$ is a bijection?

About a semigroup equipped by zero

Proving that if the semigroup (A, *) is a group, then the relation is an equivalence relation.

Proving that the binary operator of a group is commutative if the relation on the group is a partial order

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