AlgebraicJulia / AlgebraicJulia/Catlab.jl

Predicate logic of sub-C-sets

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acsets enhancement
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描述

PR #467 implemented the bi-Heyting algebra of sub-C-sets, which is the propositional fragment of the logic of a presheaf topos. We should upgrade it to predicate logic, which would involve implementing

- the pullback functor f^*: Sub(Y) -> Sub(X) induced by a C-set homomorphism f: X -> Y
- the left and right adjoints to this functor, which are generalized forms of existential and universal quantification

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