EllipticTheta[1, z, q] \[Proportional] EllipticTheta[1, z, Subscript[q, 0]] + Derivative[0, 0, 1][EllipticTheta][1, z, Subscript[q, 0]] (q - Subscript[q, 0]) + (1/2) Derivative[0, 0, 2][EllipticTheta][1, z, Subscript[q, 0]] (q - Subscript[q, 0])^2 + (1/6) Derivative[0, 0, 3][EllipticTheta][1, z, Subscript[q, 0]] (q - Subscript[q, 0])^3 + O[(q - Subscript[q, 0])^4]

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2007-05-02