Winning conjecture for badly approximable vectors on rational quadratic varieties

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Let Xm(Z)X_m(\mathbb{Z}) denote the integral points on the rational quadratic variety of parameter mm, and let BA∂Xψ(Xm(Z))BA_{\partial X}^{\psi}(X_m(\mathbb{Z})) be the set of points on ∂X\partial X badly approximable with respect to Xm(Z)X_m(\mathbb{Z}) and approximation function ψ\psi. Set

ψ(t)=t−1.\psi(t)=t^{-1}.

Winning conjecture. For every m∈Qm\in\mathbb{Q}, the set BA∂Xψ(Xm(Z))BA_{\partial X}^{\psi}(X_m(\mathbb{Z})) is a (strong) winning subset of ∂X\partial X.

This conjecture predicts that the badly approximable set is large in the sense of Schmidt games, despite being a null set when m≠0m\ne 0. Theorem and an analogous example from the literature provide supporting evidence, but the conjecture is not resolved in the supplied text.

References

Primary source

Jimmy Tseng, “Badly approximable vectors on rational quadratic varieties”, arXiv:1008.0445 (2011).

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