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arXiv 1804.04993cs.CCcs.DM
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弱保守性布尔近似计数CSP及其对铁磁双自旋的影响

Boolean approximate counting CSPs with weak conservativity, and implications for ferromagnetic two-spin

Miriam Backens, Andrei Bulatov, Leslie Ann Goldberg, Colin McQuillan, Stanislav Živný

摘要:

本文分析了近似计数约束满足问题$\mathrm{\#CSP}(\mathcal{F})$的复杂性,其中$\mathcal{F}$是布尔变量的一组非负有理值函数.一个完整的分类是已知的保守的情况下,其中$\mathcal{F}$被假定为包含任意一元函数。我们通过固定任何允许的严格增加的一元函数和任何允许的严格减少的一元函数,并仅将它们添加到$\mathcal{F}$来加强这一结果:这是弱保守性。由此产生的分类是用来解释各种各样的双自旋问题的复杂性,完全分类的铁磁情况。为了进一步削弱保守性,我们还考虑了如果只假设钉扎函数在$\mathcal{F}$中(而不是两个允许的一元数)会发生什么。我们表明,任何一组功能的钉扎是不足以恢复两种许可的一元数必须有一个非常简单的范围,或必须满足一定的单调性条件。我们展示了一组函数满足单调性条件的非平凡的例子。

英文摘要:

We analyse the complexity of approximate counting constraint satisfactions problems $\mathrm{\#CSP}(\mathcal{F})$, where $\mathcal{F}$ is a set of nonnegative rational-valued functions of Boolean variables. A complete classification is known in the conservative case, where $\mathcal{F}$ is assumed to contain arbitrary unary functions. We strengthen this result by fixing any permissive strictly increasing unary function and any permissive strictly decreasing unary function, and adding only those to $\mathcal{F}$: this is weak conservativity. The resulting classification is employed to characterise the complexity of a wide range of two-spin problems, fully classifying the ferromagnetic case. In a further weakening of conservativity, we also consider what happens if only the pinning functions are assumed to be in $\mathcal{F}$ (instead of the two permissive unaries). We show that any set of functions for which pinning is not sufficient to recover the two kinds of permissive unaries must either have a very simple range, or must satisfy a certain monotonicity condition. We exhibit a non-trivial example of a set of functions satisfying the monotonicity condition.

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