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<p><a href="page.php?w=Category_theory">category</a> of <a href="page.php?w=Boolean_algebra_%28structure%29">Boolean algebra</a>s and the category of Stone spaces. This duality means that in addition to the correspondence between Boolean algebras and their Stone spaces, each <a href="page.php?w=homomorphism">homomorphism</a> from a Boolean algebra A to a Boolean algebra B corresponds in a natural way to a continuous function from S(B) to  S(A). In other words, there is a <a href="page.php?w=contravariant_functor">contravariant functor</a> that gives</p><p>
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