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arxiv: 0712.2815 · v3 · submitted 2007-12-17 · 🧮 math.NT

Two variants of the support problem for products of abelian varieties and tori

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keywords orderproblemsupportabelianl-adicpointsradicalable
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Let G be the product of an abelian variety and a torus defined over a number field K. Let P and Q be K-rational points on G. Suppose that for all but finitely many primes p of K the order of (Q mod p) divides the order of (P mod p). Then there exist a K-endomorphism f of G and a non-zero integer c such that f(P)=cQ. Furthermore, we are able to prove the above result with weaker assumptions: instead of comparing the order of the points we only compare the radical of the order (radical support problem) or the l-adic valuation of the order for some fixed rational prime l (l-adic support problem).

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