Theorem
exp43
An exportation inference. (Contributed by NM, 26-Apr-1994.)
Hypothesis
exp43.1
\( \vdash \varphi \wedge \psi \wedge (\chi \wedge \theta) \rightarrow \tau \)
Conclusion
\( \vdash \varphi \rightarrow \psi \rightarrow \chi \rightarrow \theta \rightarrow \tau \)
Proof
exp43.1
ex
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exp4b
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