List questions from semigroup-homomorphism

Published on 23 Mar 2026 - 0:34

626

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$f (e_G )=e_H $ is necessary for Monoid homomorphisms

Published on 25 Mar 2026 - 2:15

84

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Proving an alternative version of Lallement's Lemma

Published on 25 Mar 2026 - 9:48

58

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isomorphism generalized semigroup

Published on 17 Mar 2026 - 5:28

106

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Prove that there is no bijective homomorphism from $\left(\mathbb{Q},\ +\right)$ to $\left(\mathbb{Q_+^*},\ \times \right)$

Published on 17 Mar 2026 - 0:02

38

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Proper class of operations

Published on 25 Mar 2026 - 7:18

77

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About monoid homomorphism

Published on 25 Mar 2026 - 4:42

229

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Exercise 1 pg 33 from "Algebra - T. W. Hungerford" - example for a semigroup-hom but not monoid-hom..

Published on 17 Mar 2026 - 16:43

65

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J-class properties under a surjective homomorphism

Published on 17 Mar 2026 - 18:21

150

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Proving a class of languages is closed under union when it closed under concatenation, (inverse) homomorphic images, and intersections.

Published on 22 Mar 2026 - 3:15

25

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Algorithm for computing the collection of all string homomorphisms $f$ such that $f(s) = t$ for fixed strings $s,t$

Published on 22 Mar 2026 - 6:21

64

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How many functions from $\mathbb{N}\cup\{0\}$ to $\mathbb{N}\cup\{0\}$ have $\phi(ab) = \phi(a) + \phi(b)$?

Published on 16 Mar 2026 - 18:18

99

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Is the space of monoid homomorphisms on a free monoid free?

Published on 17 Mar 2026 - 23:22

309

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free semi-group

Published on 25 Mar 2026 - 6:22

128

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General properties? of divisibility of semigroups

Published on 17 Mar 2026 - 7:59

List Question

Isomorphism between finitely generated semigroups

$f (e_G )=e_H $ is necessary for Monoid homomorphisms

Proving an alternative version of Lallement's Lemma

isomorphism generalized semigroup

Prove that there is no bijective homomorphism from $\left(\mathbb{Q},\ +\right)$ to $\left(\mathbb{Q_+^*},\ \times \right)$

Proper class of operations

About monoid homomorphism

Exercise 1 pg 33 from "Algebra - T. W. Hungerford" - example for a semigroup-hom but not monoid-hom..

J-class properties under a surjective homomorphism

Proving a class of languages is closed under union when it closed under concatenation, (inverse) homomorphic images, and intersections.

Algorithm for computing the collection of all string homomorphisms $f$ such that $f(s) = t$ for fixed strings $s,t$

How many functions from $\mathbb{N}\cup\{0\}$ to $\mathbb{N}\cup\{0\}$ have $\phi(ab) = \phi(a) + \phi(b)$?

Is the space of monoid homomorphisms on a free monoid free?

free semi-group

General properties? of divisibility of semigroups

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