satisfiable$72178$ - Definition. Was ist satisfiable$72178$
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Was (wer) ist satisfiable$72178$ - definition


Equisatisfiability         
In Mathematical logic (a subtopic within the field of formal logic), two formulae are equisatisfiable if the first formula is satisfiable whenever the second is and vice versa; in other words, either both formulae are satisfiable or both are not. Equisatisfiable formulae may disagree, however, for a particular choice of variables.
Satisfiable         
ELEMENTARY CONCEPT OF SEMANTICS
Satisfiability problem; Satisfiable; Unsatisfiable; Satisfiability and validity; Satisfiability (logics); Finite satisfiability (logics)
·adj That may be satisfied.
satisfiability problem         
  • A formula with 2 clauses may be unsatisfied (red), 3-satisfied (green), xor-3-satisfied (blue), or/and 1-in-3-satisfied (yellow), depending on the TRUE-literal count in the 1st (hor) and 2nd (vert) clause.
  • (''x'' ∨ ''x'' ∨ ''y'') ∧ (¬''x'' ∨ ¬''y'' ∨ ¬''y'') ∧ (¬''x'' ∨ ''y'' ∨ ''y'')}} reduced to a [[clique problem]]. The green vertices form a 3-clique and correspond to the satisfying assignment ''x''=FALSE, ''y''=TRUE.
  • green}} argument for each ''R'') in all lines except the first, where ''x'' ∨ ''y'' ∨ ''z'' is FALSE. '''Right:''' A simpler reduction with the same properties.
ELEMENTARY CONCEPT OF SEMANTICS
Satisfiability problem; Satisfiable; Unsatisfiable; Satisfiability and validity; Satisfiability (logics); Finite satisfiability (logics)
A problem used as an example in complexity theory. It can be stated thus: Given a Boolean expression E, decide if there is some assignment to the variables in E such that E is true. A Boolean expression is composed of Boolean variables, (logical) negation (NOT), (logical) conjunction (AND) and parentheses for grouping. The satisfiability problem was the first problem to be proved to be NP-complete (by Cook). ["Introduction to Automata Theory, Languages, and Computation" by Hopcroft and Ullman, pub. Addison-Wesley]. (1994-11-11)