Question

Is there a standard name for a set equipped only with an idempotent binary operation?

score 138 · Answer 1 · 2026-02-23 12:02:59

138

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Is there a standard name for a set equipped only with an idempotent binary operation?

Published on 23 Feb 2026 - 12:02

score 473 · Answer 2 · 2026-03-25 17:18:41

473

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$\mathbf{N}_5$ as a congruence lattice

Published on 25 Mar 2026 - 17:18

score 139 · Answer 3 · 2014-01-09 21:41:11

139

Views

Reference Request: Semi-Rings and Rings (System of Sets, not Algebraic Structures)

Published on 09 Jan 2014 - 21:41

score 57 · Answer 4 · 2014-01-11 07:31:13

57

Views

Seeking information about (category-theoretic) varieties, quasivarieties, and universal Horn classes.

Published on 11 Jan 2014 - 7:31

score 59 · Answer 5 · 2014-01-11 22:13:26

59

Views

Signatures having precisely one constant symbol, and pointed categories.

Published on 11 Jan 2014 - 22:13

score 141 · Answer 6 · 2014-01-12 23:11:14

141

Views

Which algebraic identities survive the journey to the powerset?

Published on 12 Jan 2014 - 23:11

score 116 · Answer 7 · 2014-01-13 13:15:18

116

Views

Confirmation needed of the fact that subcategory $\mathbf{Lat}$ is not full in $\mathbf{Pos}$

Published on 13 Jan 2014 - 13:15

score 195 · Answer 8 · 2014-01-14 22:03:16

195

Views

$\mathrm{Pol}_m(\mathbb{A})$ viewed as a relation pp-definable from $\mathbb{A}$

Published on 14 Jan 2014 - 22:03

score 263 · Answer 9 · 2014-01-15 20:46:56

263

Views

Do "equational theories" include sequents?

Published on 15 Jan 2014 - 20:46

score 71 · Answer 10 · 2014-01-18 14:50:07

71

Views

What is the $K$-free algebra for the class of implication algebras, over a finite set

Published on 18 Jan 2014 - 14:50

score 89 · Answer 11 · 2014-01-19 21:55:21

89

Views

Why is the collections of all groups a variety

Published on 19 Jan 2014 - 21:55

score 167 · Answer 12 · 2014-01-19 22:16:28

167

Views

Construct an algebra from its finitely generated algebras

Published on 19 Jan 2014 - 22:16

score 97 · Answer 13 · 2014-01-20 00:04:40

97

Views

Universal Algebras for Pseudovarities and their cardinality

Published on 20 Jan 2014 - 0:04

score 78 · Answer 14 · 2014-01-21 17:26:42

78

Views

How is modularity a weakened form of distributivity?

Published on 21 Jan 2014 - 17:26

score 820 · Answer 15 · 2014-01-28 23:16:41

820

Views

Why are particular combinations of algebraic properties "richer" than others?

Published on 28 Jan 2014 - 23:16

List Question

Is there a standard name for a set equipped only with an idempotent binary operation?

$\mathbf{N}_5$ as a congruence lattice

Reference Request: Semi-Rings and Rings (System of Sets, not Algebraic Structures)

Seeking information about (category-theoretic) varieties, quasivarieties, and universal Horn classes.

Signatures having precisely one constant symbol, and pointed categories.

Which algebraic identities survive the journey to the powerset?

Confirmation needed of the fact that subcategory $\mathbf{Lat}$ is not full in $\mathbf{Pos}$

$\mathrm{Pol}_m(\mathbb{A})$ viewed as a relation pp-definable from $\mathbb{A}$

Do "equational theories" include sequents?

What is the $K$-free algebra for the class of implication algebras, over a finite set

Why is the collections of all groups a variety

Construct an algebra from its finitely generated algebras

Universal Algebras for Pseudovarities and their cardinality

How is modularity a weakened form of distributivity?

Why are particular combinations of algebraic properties "richer" than others?

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