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Modular forms of weight 1/2 are constructed directly as q-expansions
following the explicit description given by Serre and Stark (see [SS77]).
For a space M of modular forms of weight 1/2, this returns the basis
of the space as described by Serre and Stark. A list of tuples is returned;
each tuple contains a character ψand an integer t, and the
corresponding modular form is the theta series defined as the sum
over all integers n of ψ(n) q^(t n2).
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