Theorem
exp42
An exportation inference. (Contributed by NM, 26-Apr-1994.)
Hypothesis
exp42.1
\( \vdash \varphi \wedge (\psi \wedge \chi) \wedge \theta \rightarrow \tau \)
Conclusion
\( \vdash \varphi \rightarrow \psi \rightarrow \chi \rightarrow \theta \rightarrow \tau \)
Proof
exp42.1
exp31
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expd
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