# unsatisfiability

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**Method of analytic tableaux**— A graphical representation of a partially built propositional tableau In proof theory, the semantic tableau (or truth tree) is a decision procedure for sentential and related logics, and a proof procedure for formulas of first order logic. The… … Wikipedia**Look-ahead (backtracking)**— In backtracking algorithms, look ahead is the generic term for a subprocedure that attempts to foresee the effects of choosing a branching variable to evaluate or one of its values. The two main aims of look ahead are to choose a variable to… … Wikipedia**Constraint logic programming**— Programming paradigms Agent oriented Automata based Component based Flow based Pipelined Concatenative Concurrent computing … Wikipedia**DPLL algorithm**— The Davis–Putnam–Logemann–Loveland (DPLL) algorithm is a complete, backtracking based algorithm for deciding the satisfiability of propositional logic formulae in conjunctive normal form, i.e. for solving the CNF SAT problem. It was introduced in … Wikipedia**Local consistency**— In constraint satisfaction, local consistency conditions are properties of constraint satisfaction problems related to the consistency of subsets of variables or constraints. Several such conditions exist, the most known being node consistency,… … Wikipedia**Backjumping**— In backtracking algorithms, backjumping is a technique that reduces search space, therefore increasing efficiency. While backtracking always goes up one level in the search tree when all values for a variable have been tested, backjumping may go… … Wikipedia**Boolean satisfiability problem**— For the concept in mathematical logic, see Satisfiability. 3SAT redirects here. For the Central European television network, see 3sat. In computer science, satisfiability (often written in all capitals or abbreviated SAT) is the problem of… … Wikipedia**Compactness theorem**— In mathematical logic, the compactness theorem states that a set of first order sentences has a model if and only if every finite subset of it has a model. This theorem is an important tool in model theory, as it provides a useful method for… … Wikipedia**Constraint programming**— Programming paradigms Agent oriented Automata based Component based Flow based Pipelined Concatenative Concurrent computin … Wikipedia**Constraint satisfaction problem**— Constraint satisfaction problems (CSP)s are mathematical problems defined as a set of objects whose state must satisfy a number of constraints or limitations. CSPs represent the entities in a problem as a homogeneous collection of finite… … Wikipedia