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===Ramanujan's class invariants===
[[Srinivasa Ramanujan|Ramanujan's]] class invariants <math>G_n</math> and <math>g_n</math> are defined as<ref>Zhang, Liang-Cheng "Ramanujan's class invariants, Kronecker's limit formula and modular equations (III)"</ref>
:<math>G_n=2^{-1/4}e^{\pi\sqrt{n}/24}\prod_{k=0}^\infty \left(1+e^{-(2k+1)\pi\sqrt{n}}\right),</math>
:<math>g_n=2^{-1/4}e^{\pi\sqrt{n}/24}\prod_{k=0}^\infty \left(1-e^{-(2k+1)\pi\sqrt{n}}\right),</math>
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