On the additive formulae of the theta functions and a collection of Lambert series pertaining to the modular equations of degree 5

Li‐Chien Shen

Transactions of the American Mathematical Society · 1994 · 43 citations · 1 references

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Abstract

We examine the connection between the additive formulae of the theta functions, the Fourier series expansion of the 12 elliptic functions, and the logarithmic derivatives of the theta functions. As an application, we study the Lambert series related to the modular equations of degree 5 and many interesting identities of Ramanujan are found in this process.

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