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In mathematics, characteristic function can refer to any of several distinct concepts:
- As a synonym for indicator function, that is the function
- In probability theory, the characteristic function of any probability distribution on the real line is given by the following formula, where X is any random variable with the distribution in question:
- The characteristic function in convex analysis:
- The characteristic state function in statistical mechanics.
- The characteristic polynomial in linear algebra.
- The Euler characteristic, a topological invariant.
- The cooperative game in game theory.
- The Receiver operating characteristic in statistical decision theory.