Is every Heyting algebra a sublattice of a Boolean algebra?

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From what I can tell, every lattice is a sublattice of a lattice with unique complements (Dilworth). A Heyting algebra is a distributive lattice. The only remaining step, then, would be to know whether the extension with unique complements preserves distributivity. If that is true, then every Heyting algebra would be a sublattice of a distributive complemented lattice, a Boolean algebra.

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Every distributive lattice is isomorphic to a lattice of sets, so in particular it is a sublattice of a Boolean algebra. Since Heyting algebras are distributive lattices, the answer to your question is affirmative.

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Heyting Algebra is not a sublattice for Boolean Algebra.since Heyting Algebra weakens x\vee x'. Boolean Algebra is asublattice for Heyting Algebra.