Abstract
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 ϕ of G and a non-zero integer c such that ϕ ( P ) = c Q . 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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