# Duality principle

(Redirected from Duality principle (disambiguation))

**Duality principle** or **principle of duality** may refer to:

- Duality (projective geometry)
- Duality (order theory)
- Duality principle (Boolean algebra)
- Duality principle for sets
- Duality principle (optimization theory)
- Lagrange duality
- Duality principle in functional analysis, used in the large sieve method of analytic number theory
- Wave–particle duality

## See also

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