In dictionaries:
riemann theta function
Ramanujan theta function
(mathematics) A theta function that generalizes the form of the Jacobi theta functions while capturing their general properties. It is defined as: f(a,b)=∑_(n=-∞) ᪲a^( frac )n(n+1)2;b^( frac )n(n-1)2 for |ab| < 1.
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