Theta function (disambiguation)
Introduction '''Theta functions'''  are special functions of several complex variables. Theta function may also refer to:
Jacobi-related functions *''q''-theta function, , a type of q-series*Theta function of a lattice, , a holomorphic function on the upper half-plane*Mock theta functions, , etc., a mock modular form of weight 1/2*Ramanujan theta function, *Neville theta functions
Other functions *Riemann–Siegel theta function, *Chebyshev function, *Feferman's function, *Heaviside step function, sometimes denoted *Lovász theta function, an upper bound on the Shannon capacity of a graph
See also *Jacobi theta functions (notational variations),