Schaar's Identity
A generalization of the Gaussian Sum. For 
and 
of opposite Parity (i.e., one is Even and the other isOdd), Schaar's identity states
See also Gaussian Sum
References
Evans, R. and Berndt, B. ``The Determination of Gauss Sums.'' Bull. Amer. Math. Soc. 5, 107-129, 1981.
- Summatory Function
- Sum-Product Number
- Sum Rule
- Sup
- Characteristic (Partial Differential Equation)
- Characteristic Polynomial
- Characteristic (Real Number)
- Character (Multiplicative)
- Character (Number Theory)
- Character Table
- Charlier's Check
- Chasles-Cayley-Brill Formula
- Chasles's Contact Theorem
- Chasles's Polars Theorem
- Chasles's Theorem
- Chebyshev Approximation Formula
- Chebyshev Constants
- Chebyshev Deviation
- Chebyshev Differential Equation
- Chebyshev Function
- Chebyshev-Gauss Quadrature
- Chebyshev Inequality
- Chebyshev Integral
- Chebyshev Integral Inequality
- Chebyshev Phenomenon