Theorem
imp43
An importation inference. (Contributed by NM, 26-Apr-1994.)
Hypothesis
imp4.1
\( \vdash \varphi \rightarrow \psi \rightarrow \chi \rightarrow \theta \rightarrow \tau \)
Conclusion
\( \vdash \varphi \wedge \psi \wedge (\chi \wedge \theta) \rightarrow \tau \)
Proof
imp4.1
imp4b
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imp
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