Definition:Tableau Proof (Propositional Tableaus)

Definition
Let $\mathbf H$ be a set of WFFs of propositional logic.

Let $\mathbf A$ be a WFF.

A tableau proof of $\mathbf A$ from $\mathbf H$ is a tableau confutation of $\mathbf H \cup \set {\neg \mathbf A}$.

This definition also applies when $\mathbf H = \O$.

Then a tableau proof of $\mathbf A$ is a tableau confutation of $\set {\neg \mathbf A}$.

If there exists a tableau proof of $\mathbf A$ from $\mathbf H$, one can write:
 * $\mathbf H \vdash_{\mathrm{PT} } \mathbf A$

Specifically, the notation:
 * $\vdash_{\mathrm{PT} } \mathbf A$

means that there exists a tableau proof of $\mathbf A$.