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22 votes
6 answers
3k views

How strong is Cantor-Bernstein-Schröder?

questions validity of CBS does not require choice, but this does not exclude the possibility that, say, the propositional part of some form of constructive set theory + CBS is strictly stronger than "mere" intuitionism
7 votes
0 answers
288 views

Two simple cases of quantifier elimination for Heyting algebras

This extracts a simple case from a cross-post at cs.SE. Here is a fact about Intuitionistic Propositional Logic: A formula $p$ is equivalent to a formula of the form $q \lor \neg q$ if and only if $\ …