Right triangles with algebraic sides and elliptic curves over number fields

Mathematics – Number Theory

Scientific paper

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To appear in Math. Slovaca

Scientific paper

10.2478/s12175-009-0126-3

Given any positive integer n, we prove the existence of infinitely many right triangles with area n and side lengths in certain number fields. This generalizes the famous congruent number problem. The proof allows the explicit construction of these triangles; for this purpose we find for any positive integer n an explicit cubic number field Q(\lambda) (depending on n) and an explicit point P_\lambda of infinite order in the Mordell-Weil group of the elliptic curve Y^2=X^3-n^2*X over Q(\lambda).

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