List questions from semigroups

Published on 10 Apr 2026 - 3:37

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Expressing Green's relations in regular semigroups

Published on 05 May 2026 - 13:15

1.6k

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In a Cayley table, which Group axioms fail when an entry appears twice in a row or a column?

Published on 06 May 2026 - 10:05

46

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Proving a left identity

Published on 10 May 2026 - 7:50

217

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Direct sum of Matrix algebras is not isomorphic to some semigroup algebra

Published on 13 Apr 2026 - 14:00

77

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Direct sum of reals and quaternions is not a semigroup algebra for some semigroup

Published on 12 Apr 2026 - 13:05

426

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Terminology for a "subgroup" that has a different identity element.

Published on 10 May 2026 - 13:48

48

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Is there a name for pairs of elements $(a,b)$ of a semigroup $S$ satisfying $\forall x,y \in S : axbayb = axyb$?

Published on 10 May 2026 - 13:51

65

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Factorising a divisor of a product

Published on 14 Apr 2026 - 3:48

211

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Is a monoid commutative if $(ab)^2=a^2b^2$?

Published on 11 Apr 2026 - 21:36

137

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Implicit operations in finite semigroups.

Published on 07 May 2026 - 13:38

68

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Understanding a particular group/semigroup operation

Published on 12 Apr 2026 - 2:34

152

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Suppose $G$ is a semigroup and it holds both left and right cancellation.

Published on 16 Apr 2026 - 13:03

70

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Question on proving $γ∨ρ=γ∘ρ∘γ$

Published on 16 Apr 2026 - 7:51

69

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Check the properties of the following operation defined on R

Published on 13 Apr 2026 - 5:19

List Question

About 3-dimensional quadratic space

Expressing Green's relations in regular semigroups

In a Cayley table, which Group axioms fail when an entry appears twice in a row or a column?

Proving a left identity

Direct sum of Matrix algebras is not isomorphic to some semigroup algebra

Direct sum of reals and quaternions is not a semigroup algebra for some semigroup

Terminology for a "subgroup" that has a different identity element.

Is there a name for pairs of elements $(a,b)$ of a semigroup $S$ satisfying $\forall x,y \in S : axbayb = axyb$?

Factorising a divisor of a product

Is a monoid commutative if $(ab)^2=a^2b^2$?

Implicit operations in finite semigroups.

Understanding a particular group/semigroup operation

Suppose $G$ is a semigroup and it holds both left and right cancellation.

Question on proving $γ∨ρ=γ∘ρ∘γ$

Check the properties of the following operation defined on R

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