# Functional equation/Related Articles

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- Dirichlet character [r]: A group homomorphism on the multiplicative group in modular arithmetic extended to a multiplicative function on the positive integers.
^{[e]} - Gamma function [r]: A mathematical function that extends the domain of factorials to non-integers.
^{[e]} - Periodic function [r]: A function that repeats itself after a while, and indefinitely.
^{[e]} - Riemann zeta function [r]: Mathematical function of a complex variable important in number theory for its connection with the distribution of prime numbers.
^{[e]} - Theta function [r]: An analytic function which is a modular form of weight one-half; more generally, the generating function for a quadratic form.
^{[e]} - Trigonometric function [r]: Function of an angle expressed as the ratio of two of the sides of a right triangle that contains that angle; the sine, cosine, tangent, cotangent, secant, and cosecant.
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