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arXiv · 2002.00888

Equal sums of two cubes of binary quadratic forms

Bruce Reznick
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Abstract

We give a complete description of all solutions to the equation $f_1^3 + f_2^3 = f_3^3 + f_4^3$ for quadratic forms $f_j \in \mathbb C[x,y]$ and show how Ramanujan's example can be extended to three equal sums of pairs of cubes. We also give a complete census in counting the number of ways a sextic $p \in \mathbb C[x,y]$ can be written as a sum of two cubes. The extreme example is $p(x,y) = xy(x^4-y^4)$, which has six such representations.

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Bruce Reznick. 2020-02-03. Equal sums of two cubes of binary quadratic forms. https://arxiv.org/abs/2002.00888

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