In mathematics, characteristic exponent may refer to:
- Characteristic exponent of a field, a number equal to 1 if the field has characteristic 0, and equal to p if the field has characteristic p > 0
- Lyapunov characteristic exponent, a quantity that characterizes the rate of separation
- Characteristic exponent of Stable distribution
- The logarithm of a characteristic function
- Logarithm of a characteristic multiplier in the Floquet theory
- Solution of the indicial equation of the Frobenius method
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