共查询到18条相似文献,搜索用时 156 毫秒
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一种逻辑强化学习的tableau推理方法 总被引:1,自引:0,他引:1
tableau方法是一种具有较强的通用性和适用性的推理方法,但由于函数符号、等词等的限制,使得自动推理具有不确定性,针对tableau推理中封闭集合构造过程具有盲目性的问题,提出将强化学习用于tableau自动推理的方法,该方法将tableau推理过程中的逻辑公式与强化学习相结合,产生抽象的状态和活动,这样一方面可以通过学习方法控制自动推理的推理顺序,形成合理的封闭分枝,减少推理的盲目性;另一方面复杂的推理可以利用简单的推理结果,提高推理的效率。 相似文献
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自由变量语义tableau中δ-规则的一种改进方法 总被引:6,自引:1,他引:5
自动推理一直是人工智能领域研究的重要内容.近几年来,由于tableau方法的通用性和直观性,引起人工智能界的广泛关注.对于自由变量语义tableau中的量词规则,由于r-规则替换的任意性,可导致在同一tableau证明中r-规则被多次使用,使得tableau推理结构树中出现多个自由变量.针对tableau中多次出现自由变量,使tableau封闭延迟的问题,在δ^ -规则的基础上,提出对δ^ -规则改进的δ^ -规则,并进行了正确性证明.将δ^ -规则应用到TableauTAP系统中,结果表明,δ^ -规则使tableau封闭提前,在推理的时间效率和空间效率上都有较大的提高. 相似文献
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自动推理作为自动定理证明的扩展是人工智能研究的基础工作,许多重要的人工智能系统都是以推理系统为其核心部分,其中的tableau方法,由于具有通用性、直观性及易于计算机实现等特点,至今成为重要的自动推理方法之一。在tableau方法基础上,讨论了一阶逻辑中的自动定理证明理论,提出使用模型存在定理证明其可靠性和完备性的方法。同时也给出了带等词tableau方法的证明过程。 相似文献
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基于Tableau的定理机器证明系统TableauTAP 总被引:2,自引:0,他引:2
使用SWI-PROLOG语言在微机上设计实现了基于tableau的定理证明系统TabIeauTAP。该系统可以证明不含等词的经典逻辑公式童耋譬逻辑公式,通过预处理自动生成tableau规则,因此容易对其功能进行扩展。应用该系统对TPTP的400个逻辑问题进行证明,实验结果表明,TableauTAP在时间和空间效率上都是比较高的。 相似文献
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针对图像恢复的全变差(TV)模型提出了一种基于交替方向乘子法的快速求解算法。通过变量替换将TV模型转化为与之完全等价的等式约束优化问题,然后用交替方向乘子法求解等式约束优化问题。实验结果表明,相对于FTVd方法,克服了FTVd方法的不稳定性,视觉效果更好,信噪比也得到了提高。 相似文献
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由经典命题公式对应着0-1-整数规划的事实,提出将tableau方法与整数规划相结合的IP-tableau方法,并提升到一阶逻辑、多值逻辑以及无穷值逻辑。将tableau转化为IP方法后,可以采用许多提高IP效率的方法。另外在多值逻辑中,随着n值的增加,IP问题不会变得更加复杂。 相似文献
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Andrei Paskevich 《Journal of Automated Reasoning》2008,40(2-3):179-194
It is well known that the connection refinement of clause tableaux with paramodulation is incomplete (even with weak connections).
In this paper, we present a new connection tableau calculus for logic with equality. This calculus is based on a lazy form
of paramodulation where parts of the unification step become auxiliary subgoals in a tableau and may be subjected to subsequent
paramodulations. Our calculus uses ordering constraints and a certain form of the basicness restriction. 相似文献
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In this paper we give a comprehensive presentation of the disconnection tableau calculus, a proof method for formulas in classical first-order clause logic. The distinguishing property of this calculus is that it uses unification in such a manner that important proof-theoretic advantages of the classical (i.e., Smullyan-style) tableau calculus are preserved, specifically the termination and model generation characteristics for certain formula classes. Additionally, the calculus is well suited for fully automated proof search. The calculus is described in detail with soundness and completeness proofs, and a number of important calculus refinements developed over the past years are presented. Referring to the model-finding abilities of the disconnection calculus, we explain the extraction and representation of models. We also describe the integration of paramodulation-based equality handling. Finally, we give an overview of related methods. 相似文献
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Hu Yunfa 《计算机科学技术学报》1990,5(3):250-258
A new method of solving Horn logic with equality,the goal-type driven method,is presented,which considers explicitly the unification operator as a gloal and merged it into the resolution process,The metho has the following advantages.The resolution and the unification have been integrated in a uniform way.The architectures of the inference engines based on Horn logic with equality are simplified,Any techniques of exploiting AND/OR parallelism to solve goals can also be applied to unification at the same time.The method can be used to integrate the styles of functional language and logic language by a uniform framework.It can also deal with infinite data structures. 相似文献
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This paper solves an open problem posed by a number of researchers: the construction of a complete calculus for matrix-based methods with rigid E-unification. The use of rigid E-unification and simultaneous rigid E-unification for such methods was proposed by Gallier et al., in 1987. After our proof of the undecidability of simultaneous rigid E-unification in 1995. (Degtyarev and Voronkov, 1996d), it became clear that one should look for more refined techniques to deal with equality in matrix-based methods. In this article, we define a complete proof procedure for first-order logic with equality based on an incomplete but terminating procedure for rigid E-unification. Our approach is applicable to the connection method and the tableau method and is illustrated on the tableau method. 相似文献
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S. V. Reeves 《Journal of Automated Reasoning》1987,3(3):225-246
An extension to the system of semantic tableaux to deal with first-order logic with equality is introduced and proved sound and complete. This involves the use of partial unification, an operation which is based on unification without the presence of variables. We show, further, that semantic tableaux with partial unification provide a sound and complete proof method without needing the functionally reflexive axioms. We also give an example of an ordering rule which allows us to provide less complex proofs in the ground case. 相似文献
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《Journal of Symbolic Computation》2000,29(2):343-372
We study free variable tableau methods for logics with term declarations. We show how to define a substitutivity rule preserving the soundness of the tableaux and we prove that some other attempts lead to unsound systems. Based on this rule, we define a sound and complete free variable tableau system and we show how to restrict its application to close branches by defining a sorted unification calculus. 相似文献
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《The Journal of Logic Programming》1984,1(3):211-223
Incorporating equality into the unification process has added great power to automated theorem provers. We see a similar trend in logic programming where a number of languages are proposed with specialized or extended unification algorithms. There is a need to give a logical basis to these languages. We present here a general framework for logic programming with definite clauses, equality theories, and generalized unification. The classic results for definite clause logic programs are extended in a simple and natural manner. The extension of the soundness and completeness of the negation-as-failure rule for complete logic programs is conceptually more delicate and represents the main result of this paper. 相似文献
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一种基于集合符号的自动推理扩展方法 总被引:1,自引:0,他引:1
在多值逻辑Tableau推理的基础上,提出了一种基于集合符号的自动推理扩展方法.将符号集合作为真值,减少了Tableau的推理分枝,并可以将适合经典逻辑的推理方法和策略应用于其中,使得非经典逻辑推理经典化.使用SWI-PROLOG语言设计实现了基于集合符号的自动推理系统,在系统中使用集合符号方法,只需要在规则库中增加推理规则,即可生成规则程序,系统本身不需要任何的修改,因此一些适合于经典逻辑的推理方法和技巧就可以很容易地应用到多值逻辑、模态逻辑、直觉逻辑等非经典逻辑,也可以进一步推广到无穷值逻辑和含模糊量词(如T-算子和S-算子)的逻辑中,对于无穷值逻辑和模糊逻辑的Tableau方法研究具有一定的借鉴作用.对TPTP中的900个逻辑问题进行了证明,实验结果表明,系统在时间和空间上效率都是较高的. 相似文献