Theorem 3expd

Exportation deduction for triple conjunction. (Contributed by NM, 26-Oct-2006.)

Hypothesis
3expd.1
\( \vdash \varphi \rightarrow \psi \wedge \chi \wedge \theta \rightarrow \tau \)
Conclusion
\( \vdash \varphi \rightarrow \psi \rightarrow \chi \rightarrow \theta \rightarrow \tau \)
Proof
3expd.1
com12 _
3exp _
com4r _