Factor Principles/Disjunction on Left
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Theorem
Formulation 1
- $p \implies q \vdash \paren {r \lor p} \implies \paren {r \lor q}$
Formulation 2
- $\vdash \paren {p \implies q} \implies \paren {\paren {r \lor p} \implies \paren {r \lor q} }$