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The study of valuations which simplifies class field theory and the theory of function fields.

There are a number of functions in various branches of mathematics known as Riemann functions. Examples include the Riemann P-series, Riemann-Siegel functions, Riemann theta ...

The space of continuously differentiable functions is denoted C^1, and corresponds to the k=1 case of a C-k function.

The property intf(y)delta(x-y)dy=f(x) obeyed by the delta function delta(x).

A function f(x) is said to be square integrable if int_(-infty)^infty|f(x)|^2dx is finite.

The function defined by y_+^alpha={y^alpha for y>0; 0 for y<=0. (1)

k_nu(x)=(e^(-x))/(Gamma(1+1/2nu))U(-1/2nu,0,2x) for x>0, where U is a confluent hypergeometric function of the second kind.

The spherical Bessel function of the second kind, denoted y_nu(z) or n_nu(z), is defined by y_nu(z)=sqrt(pi/(2z))Y_(nu+1/2)(z), (1) where Y_nu(z) is a Bessel function of the ...

A discrete function A(n,k) is called closed form (or sometimes "hypergeometric") in two variables if the ratios A(n+1,k)/A(n,k) and A(n,k+1)/A(n,k) are both rational ...

The Coulomb wave function is a special case of the confluent hypergeometric function of the first kind. It gives the solution to the radial Schrödinger equation in the ...