Satisfiability

In mathematical logic, satisfiability and validity are elementary concepts of semantics. A formula is satisfiable if it is possible to find an interpretation (model) that makes the formula true. A formula is valid if all interpretations make the formula true. The opposites of these concepts are unsatisfiability and invalidity, that is, a formula i...
Found on http://en.wikipedia.org/wiki/Satisfiability

satisfiability

(from the article `metalogic`) ...the truth or falsity of sentences in a formal system, but with respect to a logical calculus one speaks of validity (i.e., being true in all ... Completeness means that every valid sentence of the calculus is a theorem. It follows that if ~ is not a theorem, then ~ is not valid; and, ... A realizatio...
Found on http://www.britannica.com/eb/a-z/s/34
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