Abstract
Don Zagier introduced and discussed in Zagier [Proc Indian Acad Sci (Math Sci) 104(1) 57–75, 1994] a particular algebraic structure of the graded ring of modular forms. In this note we interpret it in terms of an associative deformation of this graded ring.
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The author is grateful to Ph. Bonneau, A. Weinstein and D. Zagier for fruitful discussions.
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Pevzner, M. Rankin–Cohen Brackets and Associativity. Lett Math Phys 85, 195–202 (2008). https://doi.org/10.1007/s11005-008-0266-3
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DOI: https://doi.org/10.1007/s11005-008-0266-3