Question

Show that a category of algebras has the epimorphism surjectivity property iff no algebra has a proper epic subalgebra

score 137 · Answer 1 · 2019-11-20 01:59:17

137

Views

Show that a category of algebras has the epimorphism surjectivity property iff no algebra has a proper epic subalgebra

Published on 20 Nov 2019 - 1:59

score 44 · Answer 2 · 2026-02-23 03:54:35

44

Views

On marginal subgroups and automorphisms

Published on 23 Feb 2026 - 3:54

score 137 · Answer 3 · 2019-11-21 00:35:40

137

Views

Every discriminator variety has equationally definable principal congruences

Published on 21 Nov 2019 - 0:35

score 101 · Answer 4 · 2026-03-26 13:55:14

101

Views

Is finite verbal subgroup equivalent to finite index of marginal subgroup?

Published on 26 Mar 2026 - 13:55

score 322 · Answer 5 · 2026-03-25 12:54:15

322

Views

What kind of structure is an ISP?

Published on 25 Mar 2026 - 12:54

score 159 · Answer 6 · 2019-11-29 16:28:10

159

Views

What can be said about the theory of inner product spaces using only the group structure and the mapping $(u, v, w) \mapsto \langle u, v \rangle w$?

Published on 29 Nov 2019 - 16:28

score 68 · Answer 7 · 2019-12-04 13:14:24

68

Views

First order structures: relational vs algebraic and their behaviour with respect to morphisms.

Published on 04 Dec 2019 - 13:14

score 151 · Answer 8 · 2019-12-04 13:28:13

151

Views

First order algebraic structures: which are closed with respect to substructure formation?

Published on 04 Dec 2019 - 13:28

score 46 · Answer 9 · 2019-12-05 23:45:26

46

Views

Is there a common standard for denoting sets of particular relations/functions?

Published on 05 Dec 2019 - 23:45

score 122 · Answer 10 · 2019-12-07 09:53:57

122

Views

The variety of commutative semigroups satisfying $x^3\approx x^4$ is generated by a single algebra

Published on 07 Dec 2019 - 9:53

score 309 · Answer 11 · 2026-03-25 20:35:47

309

Views

The variety generated by a free algebra

Published on 25 Mar 2026 - 20:35

score 1.6k · Answer 12 · 2026-03-25 07:47:12

1.6k

Views

Expressing associativity with only two variables

Published on 25 Mar 2026 - 7:47

score 110 · Answer 13 · 2026-03-25 17:26:10

110

Views

Can Higman's embedding theorem be generalised that way?

Published on 25 Mar 2026 - 17:26

score 96 · Answer 14 · 2026-03-25 11:16:10

96

Views

Does there exist some sort of classification of subvarieties of $\mathfrak{N}_2$?

Published on 25 Mar 2026 - 11:16

score 119 · Answer 15 · 2026-03-25 03:07:01

119

Views

Does $\mathcal C=\mathrm{Pol}(\mathrm{Inv}(\mathcal C))$ hold for clones on an infinite set?

Published on 25 Mar 2026 - 3:07

List Question

Show that a category of algebras has the epimorphism surjectivity property iff no algebra has a proper epic subalgebra

On marginal subgroups and automorphisms

Every discriminator variety has equationally definable principal congruences

Is finite verbal subgroup equivalent to finite index of marginal subgroup?

What kind of structure is an ISP?

What can be said about the theory of inner product spaces using only the group structure and the mapping $(u, v, w) \mapsto \langle u, v \rangle w$?

First order structures: relational vs algebraic and their behaviour with respect to morphisms.

First order algebraic structures: which are closed with respect to substructure formation?

Is there a common standard for denoting sets of particular relations/functions?

The variety of commutative semigroups satisfying $x^3\approx x^4$ is generated by a single algebra

The variety generated by a free algebra

Expressing associativity with only two variables

Can Higman's embedding theorem be generalised that way?

Does there exist some sort of classification of subvarieties of $\mathfrak{N}_2$?

Does $\mathcal C=\mathrm{Pol}(\mathrm{Inv}(\mathcal C))$ hold for clones on an infinite set?

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