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Resolution Refutations and Propositional Proofs with Height-Restrictions

机译:具有高度限制的分辨率反驳和命题证明

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Height restricted resolution (proofs or refutations) is a natural restriction of resolution where the height of the corresponding proof tree is bounded. Height restricted resolution does not distinguish between tree- and sequence-like proofs. We show that polylogarithmic-height resolution is strongly connected to the bounded arithmetic theory S(1/2)(α). We separate polylogarithmic-height resolution from quasi-polynomial size tree-like resolution. Inspired by this we will study infinitely many sub-linear-height restrictions given by functions n n → 2_i ((log~(i+1)_n)~(O(1)) for i ≥ 0. We show that the resulting resolution systems are connected to certain bounded arithmetic theories, and that they form a strict hierarchy of resolution proof systems. To this end we will develop some proof theory for height restricted proofs.
机译:高度限制的分辨率(证明或反驳)是对分辨率的自然限制,其中相应的证明树的高度是有界的。高度受限的分辨率无法区分树状证明和序列状证明。我们表明,多对数高度分辨率与有界算术理论S(1/2)(α)密切相关。我们将多对数高度分辨率与拟多项式大小树形分辨率分开。受此启发,我们将无限研究函数nn→2_i((log〜(i + 1)_n)〜(O(1))对于i≥0给出的许多子线性高度限制。我们证明了所得的分辨率系统与某些有界算术理论联系在一起,它们形成了严格的分辨率证明系统层次结构,为此,我们将为高度受限证明开发一些证明理论。

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