Definition:Falsifiable/Formula

Definition
Let $\LL$ be a logical language.

Let $\mathscr M$ be a formal semantics for $\LL$.

A logical formula $\phi$ of $\LL$ is falsifiable for $\mathscr M$ :


 * $\phi$ is not valid in some structure $\MM$ of $\mathscr M$

That is, there exists some structure $\MM$ of $\mathscr M$ such that:


 * $\MM \not\models_{\mathscr M} \phi$

Also see

 * Definition:Satisfiable Formula
 * Definition:Contradiction
 * Definition:Tautology
 * Definition:Contingent Statement