## Diophantine approximation and badly approximable sets

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• S. Kristensen
• R. Thorn, Queen Mary Universty of London, Storbritannien
• S. Velani, University of York, Storbritannien
• Institut for Matematiske Fag
Let (X,d) be a metric space and (Omega, d) a compact subspace of X which supports a non-atomic finite measure m.  We consider natural' classes of badly approximable  subsets of Omega. Loosely speaking, these consist of points in Omega which stay clear' of some given set of points in X. The classical set Bad of `badly approximable' numbers in the theory of Diophantine approximation falls within our framework as do the sets Bad(i,j) of simultaneously badly approximable numbers. Under various natural conditions we prove that the badly approximable subsets of Omega have full Hausdorff dimension. Applications of our general framework include those from number theory (classical, complex, p-adic and formal power series) and dynamical systems (iterated function schemes, rational maps and Kleinian groups).
Originalsprog Engelsk Advances in Mathematics 203 1 132-169 38 0001-8708 Udgivet - 2006

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