Question

Elementary embeddings

score 73 · Answer 1 · 2026-04-14 11:46:47

73

Views

Elementary embeddings

Published on 14 Apr 2026 - 11:46

score 65 · Answer 2 · 2026-04-10 19:39:41

65

Views

How many parameter-free definable subsets are there of the structure $(\mathbb{R}, *)$?

Published on 10 Apr 2026 - 19:39

score 51 · Answer 3 · 2026-04-15 08:46:01

51

Views

Lemma from paper on Elementary equivalence of profinite groups by Jarden & Lubotzky

Published on 15 Apr 2026 - 8:46

score 206 · Answer 4 · 2026-04-15 08:36:40

206

Views

Construct an elementary chain of order type $\mathbb Q$

Published on 15 Apr 2026 - 8:36

score 763 · Answer 5 · 2026-04-14 00:38:37

763

Views

Is this equivalence of the compactness theorem true?

Published on 14 Apr 2026 - 0:38

score 58 · Answer 6 · 2026-04-13 23:03:19

58

Views

Does $\vDash t=s$ imply that $t$ and $s$ are notations for the same term?

Published on 13 Apr 2026 - 23:03

score 72 · Answer 7 · 2026-04-14 09:15:50

72

Views

A sufficient condition for $\omega$-categoricity

Published on 14 Apr 2026 - 9:15

score 64 · Answer 8 · 2026-04-14 16:14:44

64

Views

Intuitive vs Formal (model-theoretic) definition of consistency of a theory

Published on 14 Apr 2026 - 16:14

score 67 · Answer 9 · 2026-04-14 12:03:25

67

Views

Prove that structure $(Q/{0}; =;*)$ has infinite number of automorphisms

Published on 14 Apr 2026 - 12:03

score 135 · Answer 10 · 2026-04-16 14:25:45

If $T$ is a maximal $L$ theory such that every finite subset of $T$ is consistent, then either $\sigma \in T$ or $\lnot \sigma \in T$.

score 69 · Answer 11 · 2026-04-13 05:16:42

69

Views

Is the structure $(\mathbb{R}, *)$ "weakly minimal" in this precise sense?

Published on 13 Apr 2026 - 5:16

score 375 · Answer 12 · 2026-04-15 05:32:30

375

Views

Deciding whether a theory $T$ is $\aleph_0$-categorical?

Published on 15 Apr 2026 - 5:32

score 24 · Answer 13 · 2026-04-13 14:40:25

24

Views

Automorphisms of a structure of non-zero rational numbers with multiplication

Published on 13 Apr 2026 - 14:40

score 100 · Answer 14 · 2026-04-12 02:50:08

100

Views

An example separating the amalgamation property from a weaker variant

Published on 12 Apr 2026 - 2:50

score 63 · Answer 15 · 2026-03-25 15:47:26

63

Views

Has anyone had studied the Riemann hypothesis with non-standard models?

Published on 25 Mar 2026 - 15:47

List Question

Elementary embeddings

How many parameter-free definable subsets are there of the structure $(\mathbb{R}, *)$?

Lemma from paper on Elementary equivalence of profinite groups by Jarden & Lubotzky

Construct an elementary chain of order type $\mathbb Q$

Is this equivalence of the compactness theorem true?

Does $\vDash t=s$ imply that $t$ and $s$ are notations for the same term?

A sufficient condition for $\omega$-categoricity

Intuitive vs Formal (model-theoretic) definition of consistency of a theory

Prove that structure $(Q/{0}; =;*)$ has infinite number of automorphisms

If $T$ is a maximal $L$ theory such that every finite subset of $T$ is consistent, then either $\sigma \in T$ or $\lnot \sigma \in T$.

Is the structure $(\mathbb{R}, *)$ "weakly minimal" in this precise sense?

Deciding whether a theory $T$ is $\aleph_0$-categorical?

Automorphisms of a structure of non-zero rational numbers with multiplication

An example separating the amalgamation property from a weaker variant

Has anyone had studied the Riemann hypothesis with non-standard models?

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