This is a disambiguation page; that is, one that just points to other pages that might otherwise have the same name. If you followed a link here, you might want to go back and fix the link, so that it points to the appropriate page.

• In physics, this refers to the case when two different models actually turn out to be equivalent. See duality (physics), wave-particle duality.
• In mathematics, see dual space, dual polyhedron, dual numbers, dual Boolean algebra, dual category, duality of categories, Pontryagin duality, De Morgan dual in logic, duality in projective geometry.

See also dualism, dual.