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Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.

1. starting page on typed predicate logic and its formulation as a two-layered type theory in natural deduction.

Anonymous

2. split contexts not needed

Anonymous

3. it doesn’t make sense to have typed predicate logic have split contexts. In particular, the rules for pullbacks in the two-sorted presentation of ETCS require the equalizer sets to be in the context of a proposition ensuring that the functions in the equalizer have the same domain and codomain.

Anonymous

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