Tree Polymatrix Games are PPAD-hard
Tree Polymatrix Games are PPAD-hard
复制标题
树多矩阵游戏是 PPAD 难的
DOI:
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发表时间:
2020
期刊:
影响因子:
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通讯作者:
Rahul Savani
中科院分区:
文献类型:
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作者:
Argyrios Deligkas;John Fearnley;Rahul Savani
We prove that it is PPAD-hard to compute a Nash equilibrium in a tree polymatrix game with twenty actions per player. This is the first PPAD hardness result for a game with a constant number of actions per player where the interaction graph is acyclic. Along the way we show PPAD-hardness for finding an $\epsilon$-fixed point of a 2D LinearFIXP instance, when $\epsilon$ is any constant less than $(\sqrt{2} - 1)/2 \approx 0.2071$. This lifts the hardness regime from polynomially small approximations in $k$-dimensions to constant approximations in two-dimensions, and our constant is substantial when compared to the trivial upper bound of $0.5$.
DOI:
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发表时间:
2016
期刊:
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影响因子:
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作者:
A. Deligkas
通讯作者:
A. Deligkas