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Transformations

Shaun Cooper
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Shaun Cooper: Massey University, Institute of Natural and Mathematical Science

Chapter Chapter 2 in Ramanujan's Theta Functions, 2017, pp 129-169 from Springer

Abstract: Abstract Suppose ω 1 and ω 2 are complex numbers that satisfy Im(ω 2∕ω 1) > 0, and let Λ ( ω 1 , ω 2 ) = m ω 1 + n ω 2 : m , n ∈ ℤ . $$\varLambda (\omega _{1},\omega _{2}) = \left \{m\omega _{1} + n\omega _{2}: m,n \in \mathbb{Z}\right \}.$$ We show how properties of Λ(ω 1, ω 2) and certain of its subsets imply transformation formulas for elliptic functions and modular forms. All positive weights can be handled in the same way, and the conditionally convergent cases of weights one and two present no extra difficulty.

Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-319-56172-1_3

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DOI: 10.1007/978-3-319-56172-1_3

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