Mathematics – Number Theory
Scientific paper
1999-10-25
Mathematics
Number Theory
7 pages, Latex 2e, plus PostScript file "planecubics.eps"
Scientific paper
We prove that for any t in Q, the curve 5 x^3 + 9 y^3 + 10 z^3 +
12((t^12-t^4-1)/(t^12-t^8-1))^3 (x+y+z)^3 = 0 in P^2 is a genus 1 curve
violating the Hasse principle. An explicit Weierstrass model for its Jacobian
E_t is given. The Shafarevich-Tate group of each E_t contains a subgroup
isomorphic to Z/3 x Z/3.
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