A New Unicity Theorem and Erdos' Problem for Polarized Semi-Abelian Varieties

Details A New Unicity Theorem and Erdos' Problem for Polarized Semi-Abelian Varieties A New Unicity Theorem and Erdos' Problem for Polarized Semi-Abelian Varieties

2009-07-29

arxiv.org/abs/0907.5066v1

Mathematics

Complex Variables

20 pages

Scientific paper

In 1988 P. Erd\"os asked if the prime divisors of $x^n -1$ for all $n=1,2, >...$ determine the given integer $x$; the problem was affirmatively answered by Corrales-Rodorig\'a\~nez and R. Schoof in 1997 together with its elliptic version. Analogously, K. Yamanoi proved in 2004 that the support of the pull-backed divisor $f^{*}D$ of an ample divisor on an abelian variety $A$ by an algebraically non-degenerate entire holomorphic curve $f: \C \to A$ essentially determines the pair $(A, D)$. By making use of a recent theorem of Noguchi-Winkelmann-Yamanoi in Nevanlinna theory, we here deal with this problem for semi-abelian varieties: namely, given two polarized semi-abelian varieties $(A_1, D_1)$, $(A_2,D_2)$ and entire non-degenerate holomorphic curves $f_i:\C\to A_i$, $i=1,2$, we classify the cases when the inclusion $\supp f_1^*D_1\subset \supp f_2^* D_2$ holds. We also apply a result of Corvaja-Zannier on linear recurrence sequences to prove an arithmetic counterpart.

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