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Constructive mathematics in the style of Bishop, including its semantics using realizabilty or topological methods.

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How strong is Cantor-Bernstein-Schröder?

The paper Cantor-Bernstein implies Excluded Middle by Cécilia Pradic and Chad E. Brown shows that Excluded Middle is equivalent to CBS in constructive set theory. I don't understand Toposes very well, …
Jim Kingdon's user avatar