List questions from universal-algebra

Published on 25 Jul 2013 - 6:30

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New kind of identities?

Published on 26 Mar 2026 - 4:51

168

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Proof that the lattice of fully invariant congruences is a sublattice of the lattice of all congruences

Published on 10 Aug 2013 - 17:11

1.1k

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Smallest Congruence Relation generated by a set

Published on 10 Aug 2013 - 23:18

310

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Categories without identities

Published on 12 Aug 2013 - 16:39

144

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Building factor semigroup w.r.t. $I_n = \{ w \in A^+ : |w| \ge n \}$.

Published on 28 Mar 2026 - 0:48

127

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A subalgebra of $P(M, \Delta)$ is a Peano Algebra

Published on 28 Mar 2026 - 3:16

253

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Does axiomatizability in zeroth-order logic have important consequences?

Published on 22 Aug 2013 - 9:47

151

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The kernel of the kernel.

Published on 22 Aug 2013 - 22:04

73

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Local smallness of Lawvere theories

Published on 23 Aug 2013 - 9:56

1.8k

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What is a subdirect product?

Published on 29 Aug 2013 - 16:32

330

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Notation for "incommensurate" elements?

Published on 02 Sep 2013 - 22:19

212

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Isomorphism of algebras $\mathbb{Q}(\cdot , +, 1)$ and $\mathbb{Z}(\cdot , +, 1)$

Published on 04 Sep 2013 - 21:09

146

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Congruence lattice of a partial algebra is algebraic

Published on 19 Sep 2013 - 19:57

109

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What big families of theories/structures are there?

Published on 25 Mar 2026 - 15:28

List Question

Why $F_{(\Omega,E)}(X)$ is a $\Omega$-structure?

New kind of identities?

Proof that the lattice of fully invariant congruences is a sublattice of the lattice of all congruences

Smallest Congruence Relation generated by a set

Categories without identities

Building factor semigroup w.r.t. $I_n = \{ w \in A^+ : |w| \ge n \}$.

A subalgebra of $P(M, \Delta)$ is a Peano Algebra

Does axiomatizability in zeroth-order logic have important consequences?

The kernel of the kernel.

Local smallness of Lawvere theories

What is a subdirect product?

Notation for "incommensurate" elements?

Isomorphism of algebras $\mathbb{Q}(\cdot , +, 1)$ and $\mathbb{Z}(\cdot , +, 1)$

Congruence lattice of a partial algebra is algebraic

What big families of theories/structures are there?

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