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- 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.
- In Analytical Psychology, this is an archetype, that is to say, one of the deep powerful symbols of the functioning of the psyche.
- In Alchemy, this refers to a dynamic principle of opposing or complementary elements or spirits.
