Twists of X(7) and primitive solutions to x^2+y^3=z^7

Abstract

We find the primitive integer solutions to x^2+y^3=z^7. A nonabelian descent argument involving the simple group of order 168 reduces the problem to the determination of the set of rational points on a finite set of twists of the Klein quartic curve X. To restrict the set of relevant twists, we exploit the isomorphism between X and the modular curve X(7), and use modularity of elliptic curves and level lowering. This leaves 10 genus-3 curves, whose rational points are found by a combination of methods.

47 pages

References in corpus (2)

• Independence of rational points on twists of a given curve
• Visualising Sha[2] in Abelian Surfaces

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