Rule of Distribution/Conjunction Distributes over Disjunction/Left Distributive/Formulation 1/Forward Implication

Definition

 * $p \land \left({q \lor r}\right) \vdash \left({p \land q}\right) \lor \left({p \land r}\right)$

Proof

 * align="right" | 10 ||
 * align="right" | 1
 * $\left({p \land q}\right) \lor \left({p \land r}\right)$
 * $\lor \mathcal{E}$
 * 3, 4-6, 7-9
 * 3, 4-6, 7-9