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Mathematics of Computation
Mathematics of Computation
ISSN 1088-6842(online) ISSN 0025-5718(print)


Ideal 9th-order multigrades and Letac's elliptic curve

Author: C. J. Smyth
Journal: Math. Comp. 57 (1991), 817-823
MSC: Primary 11D72; Secondary 11G05
MathSciNet review: 1094960
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Abstract: By showing that the elliptic curve $ ({x^2} - 13)({y^2} - 13) = 48$ has infinitely many rational points, we prove that Letac's construction produces infinitely many genuinely different ideal 9th-order multigrades. We give one (not very small) new example, and, by finding the Mordell-Weil group of the curve, show how to find all examples obtainable by Letac's method.

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PII: S 0025-5718(1991)1094960-9
Article copyright: © Copyright 1991 American Mathematical Society

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