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Mildness and the density of rational points on certain transcendental curves. (English) Zbl 1220.03034
This paper concerns the density of rational points on certain real-analytic non-algebraic plane curves. The curves in question are restricted Pfaffian, namely, one-dimensional subsets of the plane definable in the o-minimal structure $${\mathbf R}_{\text{Res\,Pfaff}}$$. The main theorem asserts that, for a non-algebraic curve $$X$$ of this type, the number $$N(X,T)$$ of rational points on the curve having both coordinates of height bounded by $$H$$ is bounded by $$c(\log H)^\gamma$$ for suitable constants $$c,\gamma$$ depending on $$X$$. The proof depends on the possibility of parameterising the curve in a suitable way, and is obtained by modifying the approach of J. Pila [Comment. Math. Univ. St. Pauli 55, No. 1, 1–8 (2006; Zbl 1129.11029)], where similar results are obtained for a more restricted type of curve definable in $${\mathbf R}_{\text{Pfaff}}$$.

##### MSC:
 03C64 Model theory of ordered structures; o-minimality 11G99 Arithmetic algebraic geometry (Diophantine geometry) 11U09 Model theory (number-theoretic aspects)
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