Theorem
imp55
An importation inference. (Contributed by Jeff Hankins, 7-Jul-2009.)
Hypothesis
imp5.1
\( \vdash \varphi \rightarrow \psi \rightarrow \chi \rightarrow \theta \rightarrow \tau \rightarrow \eta \)
Conclusion
\( \vdash \varphi \wedge (\psi \wedge (\chi \wedge \theta)) \wedge \tau \rightarrow \eta \)
Proof
imp5.1
imp4a
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imp42
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