WeierstrassSigma[2, z, {Subscript[g, 2], Subscript[g, 3]}] == Exp[(Subscript[\[Eta], 1] z^2)/(2 Subscript[\[Omega], 1])] Product[(1 + 2 q^(2 n - 1) Cos[(Pi z)/Subscript[\[Omega], 1]] + q^(4 n - 2))/(1 + q^(2 n - 1))^2, {n, 1, Infinity}]

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2001-10-29