The winning criterion for the ternary badly approximable set

Let α,β\alpha,\beta be Schmidt-game parameters, and let γA\gamma_A and γB\gamma_B denote the auxiliary constants associated with Alice's and Bob's moves. Let 3-BA~(1/6)\widetilde{\operatorname{3-BA}}(1/6) denote the modified ternary badly approximable set with parameter 1/61/6. The winning criterion. If

βγAγB,\beta\gamma_A \geq \gamma_B,

then the set 3-BA~(1/6)\widetilde{\operatorname{3-BA}}(1/6) is (α,β)(\alpha,\beta)-winning; if not, then it is (α,β)(\alpha,\beta)-losing. This gives a sharp dichotomy for the stated ternary Schmidt-game set according to the comparison of the auxiliary move parameters. The supplied text does not state any resolution beyond the assertion itself.

Sources & referencesView supporting material

Primary source

Vasiliy Neckrasov and Eric Zhan, “On Nontrivial Winning and Losing Parameters of Schmidt Games”, arXiv:2401.00614 (2025).

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