SiegelTheta
SiegelTheta[Ω, s] gives the Siegel theta function with Riemann modular matrix Ω and vector s.
SiegelTheta[{ν1, ν2}, Ω, s] gives the Siegel theta function with characteristics ν1 and ν2.
Examples
Compute a Siegel theta function:
SiegelTheta[{{I}}, {0}]
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