DLMF:20.4.E3 (Q6757)

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DLMF:20.4.E3
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    Defining formula
    θ 2 ⁡ ( 0 , q ) = 2 ⁢ q 1 / 4 ⁢ ∏ n = 1 ∞ ( 1 - q 2 ⁢ n ) ⁢ ( 1 + q 2 ⁢ n ) 2 , Jacobi-theta 2 0 𝑞 2 superscript 𝑞 1 4 superscript subscript product 𝑛 1 1 superscript 𝑞 2 𝑛 superscript 1 superscript 𝑞 2 𝑛 2 {\displaystyle{\displaystyle\theta_{2}\left(0,q\right)=2q^{1/4}\prod\limits_{n% =1}^{\infty}\left(1-q^{2n}\right)\left(1+q^{2n}\right)^{2},}}
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    DLMF:20.4.E3
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