Definition:Sound Proof System/Strongly Sound

Definition
Let $\LL$ be a logical language.

Let $\mathscr P$ be a proof system for $\LL$.

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

$\mathscr P$ is strongly sound for $\mathscr M$ :


 * Every $\mathscr P$-provable consequence is an $\mathscr M$-semantic consequence.

Symbolically, this can be expressed as the statement that, for every collection of logical formulas $\FF$, and logical formula $\phi$ of $\LL$:


 * $\FF \vdash_{\mathscr P} \phi$ implies $\FF \models_{\mathscr M} \phi$

Also see

 * Definition:Strongly Complete Proof System