Definition:Provable Consequence

Definition
Let $\mathcal P$ be a proof system for a formal language $\mathcal L$.

Let $\mathcal F$ be a collection of WFFs of $\mathcal L$.

Denote with $\mathscr P'$ the proof system obtained from $\mathscr P$ by adding all the WFFs from $\mathcal F$ as axioms.

Let $\phi$ be a theorem of $\mathscr P'$.

Then $\phi$ is called a provable consequence of $\mathcal F$, and this is denoted as:


 * $\mathcal F \vdash_{\mathscr P} \phi$

Note in particular that for $\mathcal F = \varnothing$, this notation agrees with the notation for a $\mathscr P$-theorem:


 * $\vdash_{\mathscr P} \phi$

Also known as
One also encounters phrases like:


 * $\mathcal F$ proves $\phi$
 * $\phi$ is provable from $\mathcal F$

to describe the concept of provable consequence.

Also see

 * Definition:Theorem (Formal Systems)