Theorem
imp31
An importation inference. (Contributed by NM, 26-Apr-1994.)
Hypothesis
imp31.1
\( \vdash \varphi \rightarrow \psi \rightarrow \chi \rightarrow \theta \)
Conclusion
\( \vdash \varphi \wedge \psi \wedge \chi \rightarrow \theta \)
Proof
imp31.1
imp
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imp
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