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