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nLab > Latest Changes: typed predicate logic

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

    Anonymous

    v1, current

  2. split contexts not needed

    Anonymous

    diff, v3, current

  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

    diff, v3, current

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