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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.

8 votes

Difference between constructive Dedekind and Cauchy reals in computation

As others have mentioned, there are many different variations in the exact notion of Cauchy reals and Dedekind reals which affect the answer. I will choose variations so that I can offer a counterpoin …
Ben's user avatar
  • 303
5 votes
2 answers
199 views

Products of double-negation sublocales (and probability distributions on them)

In locale theory, one can produce from any locale $A$ its double negation sublocale $A_{\neg\neg}$ via the nucleus which maps an open $U$ of $A$ to $\neg \neg U$, which is the interior of the closure …
Ben's user avatar
  • 303
5 votes
0 answers
413 views

Inductive generation of non-spatial locales

Is there an example of a locale/formal space which is not spatial (i.e., one can prove it is not spatial, rather than something like $\mathbb{R}$, where spatiality is independent in a constructive met …
Ben's user avatar
  • 303
3 votes

Products of double-negation sublocales (and probability distributions on them)

I just want to expand on Simon's answers. Simon was correct regarding my mistaken interest in probability distributions over double-negation locales. Measures, Randomness, and Sublocales by Alex Simp …
Ben's user avatar
  • 303