Theorem pm3.35

Conjunctive detachment. Theorem *3.35 of [WhiteheadRussell] p. 112. Variant of pm2.27. (Contributed by NM, 14-Dec-2002.)

Conclusion
\( \vdash \varphi \wedge (\varphi \rightarrow \psi) \rightarrow \psi \)
Proof
pm2.27
imp _