Question

Is there a finite commutative semigroup $S$ with $S^2 = S$ which is not a monoid?

score 162 · Answer 1 · 2013-12-05 06:10:28

162

Views

Is there a finite commutative semigroup $S$ with $S^2 = S$ which is not a monoid?

Published on 05 Dec 2013 - 6:10

score 397 · Answer 2 · 2026-02-23 12:05:34

397

Views

Are there interesting examples of medial non-commutative semigroups?

Published on 23 Feb 2026 - 12:05

score 332 · Answer 3 · 2013-12-07 14:46:38

332

Views

Unique idempotents in semigroups

Published on 07 Dec 2013 - 14:46

score 130 · Answer 4 · 2013-12-15 18:59:12

130

Views

Do cosets of this semigroup partition this ring?

Published on 15 Dec 2013 - 18:59

score 221 · Answer 5 · 2013-12-17 22:59:33

221

Views

(Transformation) Semigroups, the semigroup $\mathbf D_n$ and the wreath product

Published on 17 Dec 2013 - 22:59

score 63 · Answer 6 · 2013-12-26 11:46:19

63

Views

Solution $\chi$ of $\chi_k(x)=\chi_x(f_k(x))$ given $f_k$ bijective

Published on 26 Dec 2013 - 11:46

score 104 · Answer 7 · 2014-01-04 07:31:15

104

Views

If a semigroup satisfies these identities, is it necessarily commutative?

Published on 04 Jan 2014 - 7:31

score 144 · Answer 8 · 2014-01-06 09:35:33

144

Views

Does Cartesian Product and Collection of all Sets Perform a Semigroup?

Published on 06 Jan 2014 - 9:35

score 135 · Answer 9 · 2026-02-23 12:04:18

135

Views

What can we learn about a magma by studying these monoids?

Published on 23 Feb 2026 - 12:04

score 381 · Answer 10 · 2014-01-10 19:08:19

381

Views

Naturally Ordered Semigroup: Why does axioms imply order of group is infinite countable ? Why are every group equal up to isomorphism?

Published on 10 Jan 2014 - 19:08

score 131 · Answer 11 · 2014-01-13 01:39:17

131

Views

looking for books on topological semigroup:

Published on 13 Jan 2014 - 1:39

score 98 · Answer 12 · 2014-01-15 16:34:21

98

Views

Testing for the cancellation laws

Published on 15 Jan 2014 - 16:34

score 218 · Answer 13 · 2014-01-28 10:26:44

218

Views

What does $\mathcal{J}$ stand for in Green relations?

Published on 28 Jan 2014 - 10:26

score 39 · Answer 14 · 2014-01-30 20:22:12

39

Views

How to calculate when a specific semigroup is closed under conjugation by this group.

Published on 30 Jan 2014 - 20:22

score 72 · Answer 15 · 2026-03-27 23:14:03

72

Views

Generalising cover maps from monoids to semigroups

Published on 27 Mar 2026 - 23:14

List Question

Is there a finite commutative semigroup $S$ with $S^2 = S$ which is not a monoid?

Are there interesting examples of medial non-commutative semigroups?

Unique idempotents in semigroups

Do cosets of this semigroup partition this ring?

(Transformation) Semigroups, the semigroup $\mathbf D_n$ and the wreath product

Solution $\chi$ of $\chi_k(x)=\chi_x(f_k(x))$ given $f_k$ bijective

If a semigroup satisfies these identities, is it necessarily commutative?

Does Cartesian Product and Collection of all Sets Perform a Semigroup?

What can we learn about a magma by studying these monoids?

Naturally Ordered Semigroup: Why does axioms imply order of group is infinite countable ? Why are every group equal up to isomorphism?

looking for books on topological semigroup:

Testing for the cancellation laws

What does $\mathcal{J}$ stand for in Green relations?

How to calculate when a specific semigroup is closed under conjugation by this group.

Generalising cover maps from monoids to semigroups

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