feat: products of Heyting algebras #136
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Heyting algebras are stable under cartesian product. A reference is here: https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/Heyting/Basic.html#Prod.instHeytingAlgebra
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Adds an instance:
Heyting algebras are stable under cartesian product.
A reference is here:
https://leanprover-community.github.io/mathlib4_docs/Mathlib/Order/Heyting/Basic.html#Prod.instHeytingAlgebra