List questions from semigroups

Published on 23 Feb 2026 - 4:56

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Stirling numbers of the second kind: a recurrence relation.

Published on 23 Apr 2017 - 17:43

165

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Example of subdirect product of the family of near-ring $S_i$

Published on 25 Apr 2017 - 11:21

358

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Necessary condition for left simple semigroup with an idempotent

Published on 25 Apr 2017 - 13:36

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The relation $a\theta_n^Sb$ iff $(\forall x\in S^n)\, xa=xb$.

Published on 27 Apr 2017 - 19:27

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Definition of groups

Published on 25 Mar 2026 - 6:13

175

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A (New?) Bilateral Babylonian Method for Calculating Square Roots

Published on 29 Apr 2017 - 2:13

71

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Showing $|\mathcal{I}_X|=\sum_{r=0}^n{n \choose r}^2r!$.

Published on 01 May 2017 - 15:43

306

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Does commutativity of $+$ on $\mathbb{N}$ imply the associativity of $+$ on $\mathbb{N}$?

Published on 23 Feb 2026 - 12:07

340

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Exercise 2.6.1 of Howie's "Fundamentals of Semigroup Theory".

Published on 23 Feb 2026 - 13:45

76

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Semigroup divisibility, transitivity property

Published on 25 Mar 2026 - 16:51

123

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Green's equivalences on the bicyclic semigroup.

Published on 05 May 2017 - 17:15

149

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Deducing a lattice is modular.

Published on 23 Feb 2026 - 13:47

59

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Idempotent endomorphism on finite monogenic monoid onto its subgroup

Published on 28 Mar 2026 - 4:40

157

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The Baer-Levi semigroup is right simple and right cancellative, but neither left simple nor left cancellative.

Published on 08 May 2017 - 18:27

List Question

Showing $\mathscr{P}_n=\langle\zeta, \tau, \pi, \xi\rangle$.

Stirling numbers of the second kind: a recurrence relation.

Example of subdirect product of the family of near-ring $S_i$

Necessary condition for left simple semigroup with an idempotent

The relation $a\theta_n^Sb$ iff $(\forall x\in S^n)\, xa=xb$.

Definition of groups

A (New?) Bilateral Babylonian Method for Calculating Square Roots

Showing $|\mathcal{I}_X|=\sum_{r=0}^n{n \choose r}^2r!$.

Does commutativity of $+$ on $\mathbb{N}$ imply the associativity of $+$ on $\mathbb{N}$?

Exercise 2.6.1 of Howie's "Fundamentals of Semigroup Theory".

Semigroup divisibility, transitivity property

Green's equivalences on the bicyclic semigroup.

Deducing a lattice is modular.

Idempotent endomorphism on finite monogenic monoid onto its subgroup

The Baer-Levi semigroup is right simple and right cancellative, but neither left simple nor left cancellative.

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