Rankin-Cohen brackets and associativity
\textit{D. Zagier} introduced and discussed in [Proc. Indian Acad. Sci., Math. Sci. 104, No.~1, 57--75 (1994; Zbl 0806.11022)] a particular algebraic structure of the graded ring of modular forms, which is derived from the Rankin-Cohen brackets. In this paper, this structure is interpreted in terms of an associative deformation (star product) of this graded ring . More precisely, it is related to the Moyal star product on \({\mathbb C}^4\).
scientific article; zbMATH DE number 5544988
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