Theorem
exp4d
An exportation inference. (Contributed by NM, 26-Apr-1994.)
Hypothesis
exp4d.1
\( \vdash \varphi \rightarrow \psi \wedge (\chi \wedge \theta) \rightarrow \tau \)
Conclusion
\( \vdash \varphi \rightarrow \psi \rightarrow \chi \rightarrow \theta \rightarrow \tau \)
Proof
exp4d.1
expd
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exp4a
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