Exact count conjecture for time-invariant Nash equilibria

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Let Q:(0,∞)→NQ:(0,\infty)\to\mathbb{N} denote the maximum cardinality of a set of mutually shift-inequivalent time-invariant Nash equilibria for the game Standard⁡(x)\operatorname{Standard}(x), and let λ\lambda be the endpoint parameter for the admissible Mina-margin interval. Exact-count conjecture.

Q(x)=2when x∈(λ,λ−1),Q(x)=1when x∈{λ,λ−1}.Q(x)=2\quad\text{when }x\in(\lambda,\lambda^{-1}),\qquad Q(x)=1\quad\text{when }x\in\{\lambda,\lambda^{-1}\}.

This refines the preceding existence result by asserting uniqueness up to shift in the interior and at both endpoints; the supplied text gives no resolution.

References

Primary source

Alan Hammond, “On the Trail of Lost Pennies: player-funded tug-of-war on the integers”, arXiv:2209.07451 (2026).

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