Question

Why are groups more important than semigroups?

score 4.5k · Answer 1 · 2026-03-25 18:24:45

4.5k

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Why are groups more important than semigroups?

Published on 25 Mar 2026 - 18:24

score 728 · Answer 2 · 2012-01-26 23:52:04

728

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clarification on the definition of meaningful product

Published on 26 Jan 2012 - 23:52

score 206 · Answer 3 · 2012-01-28 00:19:41

206

Views

Group Theory Simple Proof

Published on 28 Jan 2012 - 0:19

score 484 · Answer 4 · 2012-02-02 08:23:11

484

Views

Existence of universal enveloping inverse semigroup (similar to "Grothendieck group")

Published on 02 Feb 2012 - 8:23

score 987 · Answer 5 · 2026-03-28 21:51:29

987

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Eilenberg's rational hierarchy of nonrational automata & languages

Published on 28 Mar 2026 - 21:51

score 4.6k · Answer 6 · 2012-02-03 21:28:56

4.6k

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How many associative binary operations there are on a finite set?

Published on 03 Feb 2012 - 21:28

score 821 · Answer 7 · 2012-02-13 02:04:32

821

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Does every continuous time minimal Markov chain have the Feller property?

Published on 13 Feb 2012 - 2:04

score 2.6k · Answer 8 · 2012-02-21 20:11:23

2.6k

Views

Proving the set of functions from $\mathbb{R}$ to $\mathbb{R}$ form a semigroup under composition

Published on 21 Feb 2012 - 20:11

score 1.1k · Answer 9 · 2026-03-26 12:46:13

1.1k

Views

Name for Cayley graph of a semigroups?

Published on 26 Mar 2026 - 12:46

score 213 · Answer 10 · 2026-03-28 13:20:40

213

Views

Does a binoid contain an empty word?

Published on 28 Mar 2026 - 13:20

score 301 · Answer 11 · 2012-03-04 07:44:20

301

Views

Evans' theorem of embeddings into 2-generator semigroup.

Published on 04 Mar 2012 - 7:44

score 1k · Answer 12 · 2012-03-04 12:49:22

1k

Views

If the product of two idempotents is idempotent, must the two idempotents commute?

Published on 04 Mar 2012 - 12:49

score 339 · Answer 13 · 2026-03-27 22:05:01

339

Views

Must a pseudoinverse of a von Neumann regular element be regular?

Published on 27 Mar 2026 - 22:05

score 161 · Answer 14 · 2012-03-10 14:22:45

161

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Is there an upper bound to the number of rings that can be obtained from a semigroup with zero by defining an additive operation?

Published on 10 Mar 2012 - 14:22

score 1.9k · Answer 15 · 2012-03-15 19:18:06

1.9k

Views

Ring without distributive law?

Published on 15 Mar 2012 - 19:18

List Question

Why are groups more important than semigroups?

clarification on the definition of meaningful product

Group Theory Simple Proof

Existence of universal enveloping inverse semigroup (similar to "Grothendieck group")

Eilenberg's rational hierarchy of nonrational automata & languages

How many associative binary operations there are on a finite set?

Does every continuous time minimal Markov chain have the Feller property?

Proving the set of functions from $\mathbb{R}$ to $\mathbb{R}$ form a semigroup under composition

Name for Cayley graph of a semigroups?

Does a binoid contain an empty word?

Evans' theorem of embeddings into 2-generator semigroup.

If the product of two idempotents is idempotent, must the two idempotents commute?

Must a pseudoinverse of a von Neumann regular element be regular?

Is there an upper bound to the number of rings that can be obtained from a semigroup with zero by defining an additive operation?

Ring without distributive law?

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