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Published online by Cambridge University Press: 22 January 2016
We shall denote by the Z-module of integral vectors of dimension r, by T a symmetric complex matrix with positive definite imaginary part and by g the variable vector. If we put
and
the fundamental theta function
is expressed in the form:
as a series in q and u. Other theta functions in the classical theory are derived from the fundamental theta function by translating the origin and making sums and products, so these theta functions are also expressed in the form:
as series of q and u. Moreover the coefficients in the relations of theta functions are also expressed in the form:
as series in q.