Centres of Plant Diversity. A Guide and Strategy for their Conservation. WWF and IUCN. 29.6 x 21.3 cm. 3 volumes. 1, xiv + 354; 2, xiv + 578; 3, in press. Cambridge, UK: IUCN Publications Unit, 1994-1996. Price per volume: 1, f30, 2, f45, and 3, in press. Vol. 1, ISBN 2 8317 0197 X, Vol. 2, ISBN 2 8317 0198 8.

A Note on Twists of (y^2=x^3+1)

‎‎In the category of Mordell curves (E_D:y^2=x^3+D) with nontrivial torsion groups we find curves of the generic rank two as quadratic twists of (E_1), ‎and of the generic rank at least two and at least three as cubic twists of (E_1). ‎Previous work‎, ‎in the category of Mordell curves with trivial torsion groups‎, ‎has found infinitely many elliptic curves with ...

a note on twists of (y^2=x^3+1)

‎‎in the category of mordell curves (e_d:y^2=x^3+d) with nontrivial torsion groups we find curves of the generic rank two as quadratic twists of (e_1), ‎and of the generic rank at least two and at least three as cubic twists of (e_1). ‎previous work‎, ‎in the category of mordell curves with trivial torsion groups‎, ‎has found infinitely many elliptic curves with rank at least seven as sextic tw...

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