Factor Principles/Conjunction on Left

Theorem

Formulation 1

$p \implies q \vdash \paren {r \land p} \implies \paren {r \land q}$

Formulation 2

$\vdash \paren {p \implies q} \implies \paren {\paren {r \land p} \implies \paren {r \land q} }$
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