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Results tagged with lo.logic
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user 16722
first-order and higher-order logic, model theory, set theory, proof theory, computability theory, formal languages, definability, interplay of syntax and semantics, constructive logic, intuitionism, philosophical logic, modal logic, completeness, Gödel incompleteness, decidability, undecidability, theories of truth, truth revision, consistency.
7
votes
Stable theory: question about definability of independece
First, the relation $R(x,y)$ as you defined it is in general not type-definable (although it is definable in any $\aleph_0$-categorical theory, since it is invariant). Indeed, take any stable structu …
- 577
3
votes
Accepted
Semigroup product of the left-invariant completion of a Polish group (restatement of Questio...
In the end it was the original question which was answered first.
The answer to Is there a relational countable ultra-homogeneous structure whose countable substructures do not have the amalgamation …
- 577
5
votes
1
answer
340
views
Semigroup product of the left-invariant completion of a Polish group (restatement of Questio...
This is a re-statement, of sorts, of the question Is there a relational countable ultra-homogeneous structure whose countable substructures do not have the amalgamation property?, so far unanswered.
…
- 577
16
votes
3
answers
1k
views
Is there a relational countable ultra-homogeneous structure whose countable substructures do...
Is there a relational countable ultra-homogeneous structure whose countable substructures do not have the amalgamation property?
The question can be stated in a fashion not requiring much backgro …
- 577