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Let X be an elliptic K3 surface endowed with two distinct Jacobian elliptic fibrations π i , i = 1, 2, defined over a number field k. We prove that there is an elliptic curve C ⊂ X such that the generic rank over k of X after a base extension by C is strictly larger than the generic rank of X. Moreover, if the generic rank of π j is positive then there are infinitely many fibers of π i (j ≠ i) with rank at least the generic rank of π i plus one.
Bulletin of the Brazilian Mathematical Society, New Series – Springer Journals
Published: Apr 12, 2012
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