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Preprint Number 1084

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1084. P. Habegger
Diophantine Approximations on Definable Sets

Submission date: 16 August 2016


Consider the vanishing locus of a real analytic function on R^n restricted to [0,1]^n. We bound the number of rational points of bounded height that approximate this set very well. Our result is formulated and proved in the context of o-minimal structure which give a general framework to work with sets mentioned above. It complements the theorem of Pila-Wilkie that yields a bound of the same quality for the number of rational points of bounded height that lie on a definable set. We focus our attention on polynomially bounded o-minimal structures, allow algebraic points of bounded degree, and provide an estimate that is uniform over some families of definable sets. We apply these results to study fixed length sums of roots of unity that are small in modulus.

Mathematics Subject Classification: Primary: 11J83, Secondary: 03C64, 11G50

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Full text arXiv 1608.04547: pdf, ps.

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