Abstract
We give an elementary proof of an identity due to L. Lorenz giving the number of representations of a positive integer by the quadratic form x2 + 2y2 using Jacobi's triple product identity.
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Varouchas, J. Démonstration Élémentaire d'une Identité de Lorenz. The Ramanujan Journal 2, 495–498 (1998). https://doi.org/10.1023/A:1009732927027
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DOI: https://doi.org/10.1023/A:1009732927027