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variants of this functions
EllipticTheta






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Elliptic Functions > EllipticTheta[2,z,q] > Introduction to the Jacobi theta functions





Connections within the group of Jacobi theta functions and with other function groups

Representations through related equivalent functions

The elliptic theta functions , , , and can be represented through the Weierstrass sigma functions by the following formulas:

where , are the Weierstrass half-periods and is the Weierstrass zeta function.

The ratios of two different elliptic theta functions , , , and can be expressed through corresponding elliptic Jacobi functions with power factors by the following formulas:

where is an elliptic nome and is a complete elliptic integral.

Representations through other Jacobi theta functions

Each of the theta functions , , , and can be represented through the other theta functions by the following formulas:

The derivatives of the theta functions , , , and can also be expressed through the other theta functions and their derivatives by the following formulas:





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