Rule of Distribution/Conjunction Distributes over Disjunction/Right Distributive/Formulation 1/Proof by Truth Table

Theorem

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

Proof
We apply the Method of Truth Tables to the proposition.

As can be seen by inspection, the truth values under the main connectives match for all models.

$\begin{array}{|ccccc||ccccccc|} \hline (q & \lor & r) & \land & p & (q & \land & p) & \lor & (r & \land & p) \\ \hline F & F & F & F & F & F & F & F & F & F & F & F \\ F & F & F & F & T & F & F & T & F & F & F & T \\ F & T & T & F & F & F & F & F & F & T & F & F \\ F & T & T & T & T & F & F & T & T & T & T & T \\ T & T & F & F & F & T & F & F & F & F & F & F \\ T & T & F & T & T & T & T & T & T & F & F & T \\ T & T & T & F & F & T & F & F & F & T & F & F \\ T & T & T & T & T & T & T & T & T & T & T & T \\ \hline \end{array}$