List questions from semigroups

Published on 11 Sep 2013 - 15:43

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A combinatoric theorem about semigroups

Published on 17 Sep 2013 - 0:12

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Is associative binary operator closed on this subset?

Published on 17 Sep 2013 - 15:41

107

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How could I prove that the equality $a^na^m=a^{n+m}$ in a semigroup with identity?

Published on 21 Sep 2013 - 12:59

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How could I understand this sentence:

Published on 22 Sep 2013 - 1:22

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Example for a claim

Published on 22 Sep 2013 - 2:12

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Why $f(x)=x$ for any $x\in f(X)$?

Published on 22 Sep 2013 - 6:25

319

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Does the Trace product in a semigroup have any relation with Trace of a matrix / matrix product

Published on 23 Sep 2013 - 21:03

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Idempotents in $M_2(\mathbb{C})$

Published on 27 Mar 2026 - 2:08

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G is a group if and only if for all $a,b∈G$, $ax=b$ has solution; true or false? Why?

Published on 25 Sep 2013 - 23:03

239

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Completing a Partially Defined Associative Binary Operation

Published on 06 Oct 2013 - 13:51

473

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Semigroup isomorphism

Published on 09 Oct 2013 - 16:38

172

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Semigroups isomorphism

Published on 09 Oct 2013 - 16:53

104

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semigroup ideals

Published on 15 Oct 2013 - 10:35

63

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Proper term for a monotonic magma

Published on 23 Feb 2026 - 12:02

List Question

Why is two-element null semigroup excluded from the $0$-simple semigroup definition?

A combinatoric theorem about semigroups

Is associative binary operator closed on this subset?

How could I prove that the equality $a^na^m=a^{n+m}$ in a semigroup with identity?

How could I understand this sentence:

Example for a claim

Why $f(x)=x$ for any $x\in f(X)$?

Does the Trace product in a semigroup have any relation with Trace of a matrix / matrix product

Idempotents in $M_2(\mathbb{C})$

G is a group if and only if for all $a,b∈G$, $ax=b$ has solution; true or false? Why?

Completing a Partially Defined Associative Binary Operation

Semigroup isomorphism

Semigroups isomorphism

semigroup ideals

Proper term for a monotonic magma

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