# Consistency

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* Consistency* has three technical meanings:

- In mathematics and logic, as well as in theoretical physics, it refers to the proposition that a formal theory or a physical theory contains no contradictions. See consistency proof.
- In statistics, consistency refers to a property of estimators.
- In decision theory, a voting system is called "consistent" if and only if it guarantees that whenever option A is the winner both in district 1 and district 2 then option A must also be the winner in the combined district.

Consistency is also occasionally used as a synonym for density or viscosity.

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