metamath / set.mm

Metamath source file for logic and set theory
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Add dcapncf to iset.mm #4060

Closed jkingdon closed 3 weeks ago

jkingdon commented 3 weeks ago

This is a theorem somewhat similar to an exercise in the HoTT book but which also arose out of our discussion at https://github.com/metamath/set.mm/issues/3757#issuecomment-1890009714 .