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Results tagged with lo.logic
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user 115247
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
1
answer
390
views
Definability of ordinals in various signatures
Recently, I've been studying what the definable subsets of the countable ordinals "look like" from the perspective of bare-bones first order logic (not set theory) equipped with various ways to "acces …
- 509
28
votes
3
answers
3k
views
What sorts of extra axioms might we add to ZFC to compute higher Busy Beaver numbers?
First, some context. Ever since I was a high schooler, I have been fascinated with large numbers. As I have grown in mathematical maturity, I have become both disappointed and fascinated to see that t …
- 509