Theorem 3imp21

The importation inference 3imp with commutation of the first and second conjuncts of the assertion relative to the hypothesis. (Contributed by Alan Sare, 11-Sep-2016.) (Revised to shorten 3com12 by Wolf Lammen, 23-Jun-2022.)

Hypothesis
3imp.1
\( \vdash \varphi \rightarrow \psi \rightarrow \chi \rightarrow \theta \)
Conclusion
\( \vdash \psi \wedge \varphi \wedge \chi \rightarrow \theta \)
Proof
3imp.1
com13 _
3imp231 _