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Skolemization corresponds to the so-called type theoretic axiom of choice, which is briefly discussed in section 1.6 of the HoTT book. This provides an equivalence along which we can swap $\Sigma$ and $\Pi$ types. Assuming $A : U$, $B : A \to U$ and $C : \prod_{a : A} B\,a \to U$, we have an equivalence: $$ac : \Big(\prod_{a : A}\sum_{b : B\,a}\,C\,a\,b\...

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