Theorem com14

Commutation of antecedents. Swap 1st and 4th. (Contributed by NM, 25-Apr-1994.) (Proof shortened by Wolf Lammen, 28-Jul-2012.)

Hypothesis
com4.1
\( \vdash \varphi \rightarrow \psi \rightarrow \chi \rightarrow \theta \rightarrow \tau \)
Conclusion
\( \vdash \theta \rightarrow \psi \rightarrow \chi \rightarrow \varphi \rightarrow \tau \)
Proof
com4.1
com4l _
com3r _