Search Results
| Search type | Search syntax |
|---|---|
| Tags | [tag] |
| Exact | "words here" |
| Author |
user:1234 user:me (yours) |
| Score |
score:3 (3+) score:0 (none) |
| Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
| Views | views:250 |
| Code | code:"if (foo != bar)" |
| Sections |
title:apples body:"apples oranges" |
| URL | url:"*.example.com" |
| Saves | in:saves |
| Status |
closed:yes duplicate:no migrated:no wiki:no |
| Types |
is:question is:answer |
| Exclude |
-[tag] -apples |
| For more details on advanced search visit our help page | |
Results tagged with model-theory
Search options not deleted
user 16537
Model theory is the branch of mathematical logic which deals with the connection between a formal language and its interpretations, or models.
3
votes
Accepted
Is every cancellative semigroup a subdirect product of subdirectly irreducible cancellative ...
Sorry for answering my own question, but YCor's construction in a related thread (here) gave me a lightbulb moment. Hopefully, it's not a broken lightbulb.
The answer to the question asked in the OP …
- 10.5k
7
votes
2
answers
459
views
Is every cancellative semigroup a subdirect product of subdirectly irreducible cancellative ...
By a classical result of Birkhoff (that is, Theorem 2 in [G. Birkhoff, Subdirect unions in universal algebra, Bull. AMS, 1944]) and the trivial fact that the class of semigroups is closed under the ta …
- 10.5k
1
vote
0
answers
194
views
Reference request: Models of isomorphic languages result into isomorphic categories
This is basically a reference request by someone who has not been educated as a logician and would like to be rigorous about certain preliminary aspects of model theory.
Fix an uncountable universe $ …
- 10.5k
4
votes
2
answers
1k
views
Every abelian torsion-free group is strictly totally orderable (via the compactness theorem)
Let $\mathbb G = (G, +)$ be a group. We say that $\mathbb G$ is strictly totally orderable (others would say bi-orderable) if there exists a total order $\preceq$ on $G$ such that $x+z \prec y + z$ an …
- 10.5k