Theorem com4l

Commutation of antecedents. Rotate left. (Contributed by NM, 25-Apr-1994.) (Proof shortened by Mel L. O'Cat, 15-Aug-2004.)

Hypothesis
com4.1
\( \vdash \varphi \rightarrow \psi \rightarrow \chi \rightarrow \theta \rightarrow \tau \)
Conclusion
\( \vdash \psi \rightarrow \chi \rightarrow \theta \rightarrow \varphi \rightarrow \tau \)
Proof
com4.1
com3l _
com34 _