Abstract
Let Λ be a lattice in , and let be a definable family in an O-minimal structure over . We give sharp estimates for the number of lattice points in the fibers . Along the way, we show that for any subspace of dimension j>0 the j-volume of the orthogonal projection of ZT to Σ is, up to a constant depending only on the family Z, bounded by the maximal j-dimensional volume of the orthogonal projections to the j-dimensional coordinate subspaces.

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