Paradox separation deductive reasoning method based on extended triangle in propositional logic

A technology of propositional logic and reasoning method, applied in the direction of reasoning method, etc., can solve the problems that the ability and efficiency cannot meet the objective needs, cannot reflect the cooperative logical relationship of multiple clauses, and the clause set S cannot be satisfied, etc.

Pending Publication Date: 2018-11-23
SOUTHWEST JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

Binary resolution selects two clauses with complementary pairs from the clause set S to be determined each time, deletes the complementary pair from the two clauses, and adds the new clauses formed by the disjunction of the remaining words into the clause set S, and repeats As above process, until an empty clause is obtained, it can be determined that the clause set S is unsatisfiable
[0005] Although the automatic reasoning system based on the resolution principle has made many achievements, it is still far from meeting the objective nee

Method used

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  • Paradox separation deductive reasoning method based on extended triangle in propositional logic
  • Paradox separation deductive reasoning method based on extended triangle in propositional logic
  • Paradox separation deductive reasoning method based on extended triangle in propositional logic

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Effect test

Embodiment 1

[0063] Let clause set S={C in propositional logic 1 ,C 2 ,C 3 ,C 4 ,C 5 ,C 6 ,C 7 ,C 8 ,C 9 ,C 10}, C 1 = 1, C 2 = 2, C 3 =~1∨~2∨3, C 4 =~1∨4, C 5 =~4∨5,C 6 =~3∨~5,C 7 =~3∨7, C 8 =~5∨~7,C 9 =~3∨~4, C 10 =~2∨~7; wherein 1, 2, 3, 4, 5, 6, 7 are proposition variables. For the clause set S, there are two deduction based on the extended triangle method as follows.

[0064] Approach 1: Select clause C 1 ,C 2 ,C 3 ,C 7 ,C 10 , from these clauses construct the extended triangular contradiction in,

[0065]

[0066] The corresponding contradictory separation formula is an empty clause.

[0067] Approach 2: Select clause C 1 ,C 2 ,C 3 ,C 4 ,C 5 ,C 6 , from these clauses construct the extended triangular contradiction in,

[0068]

[0069] The corresponding contradictory separation formula is an empty clause.

[0070] The above two methods can obtain an extended triangle with no words above the main boundary line, that is, the separation of cont...

Embodiment 2

[0072] Let clause set S={C in propositional logic 1 ,C 2 ,C 3 ,C 4 ,C 5 ,C 6 ,C 7}, C1 =~3∨~7,C 2 =2∨3∨5∨~6,C 3 =1∨~2∨5∨~7,C 4 =1∨3∨~5,C 5 =3∨4∨6,C 6 =~1∨3,C 7 =7; 1, 2, 3, 4, 5, 6, 7 are propositional variables. For the clause set S, the following extended triangle can be constructed.

[0073] Practice: select clause C 1 ,C 2 ,C 3 ,C 4 ,C 5 ,C 6 ,C 7 , from these clauses construct the extended triangular contradiction in,

[0074]

[0075] The corresponding contradictory separation formula is

[0076] because And all the clauses in S are used in the construction of the extended triangular contradiction, so it can be concluded that the clause set S is satisfiable, and a satisfiable example of S is obtained: ~3, ~6, ~2, ~5,4, ~1,7.

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Abstract

The invention discloses a paradox separation deductive reasoning method based on an extended triangle in propositional logic. The method comprises the following steps that: for a clause set S in the propositional logic, constructing an extended triangle paradox, forming a paradox separation formula, and judging clause set attributes according to the paradox separation formula; if a judgment resultshows that the clause set can not be satisfied, stopping; otherwise, adding the obtained paradox separation formula into an original clause set to form a new clause set; and then, constructing and separating the extended triangle paradox, and stopping until the judgment conclusion of clause set attributes is obtained or a set condition is met. The invention provides an effective dynamic automaticdeductive reasoning method based on paradox separation, a collaborative logic relationship among a plurality of clauses can be effectively described, and the method can be applied to fields includingprogram verification, automated theorem proving and the like.

Description

technical field [0001] The invention belongs to the technical field of automatic deductive reasoning based on logic, and relates to a multivariate dynamic automatic deductive reasoning method based on extended triangle-based contradiction separation in propositional logic. Background technique [0002] A large number of scientific problems in the fields of logic, mathematics, system optimization, artificial intelligence, computer science, etc. can be formalized into logical representations. One of the essences of solving these problems is to analyze the attributes of the corresponding logical formulas (satisfiability or unsatisfiability (constant False)), but because of its abstraction, complexity, and scale, it is impossible to effectively implement logical reasoning and solution artificially, so it needs to be automatically judged by a computer. Automatic reasoning is the process of formalizing the reasoning process through a series of symbols, and making the computer auto...

Claims

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Application Information

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IPC IPC(8): G06N5/04
CPCG06N5/042G06N5/045
Inventor 徐扬陈树伟刘军何星星钟小梅
Owner SOUTHWEST JIAOTONG UNIV
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