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Heated-Gaming/0Trinitarianism/Quest2.agda

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module 0Trinitarianism.Quest2 where
open import 0Trinitarianism.Preambles.P2
isEven : Type
isEven zero =
isEven (suc zero) =
isEven (suc (suc n)) = isEven n
{-
This is a comment block.
Remove this comment block and formulate
'there exists an even natural' here.
-}
_×_ : Type Type Type
A × C = Σ A (λ a C)
div2 : Σ isEven
div2 (zero , snd₁) = zero
div2 (suc (suc fst₁) , snd₁) = suc (div2 ( fst₁ , snd₁))
private
postulate
A B C : Type
uncurry : (A B C) (A × B C)
uncurry f x = f (fst x) (snd x)
curry : (A × B C) (A B C)
curry f a b = f (a , b)