Theorem
3imp231
Importation inference. (Contributed by Alan Sare, 17-Oct-2017.)
Hypothesis
3imp.1
\( \vdash \varphi \rightarrow \psi \rightarrow \chi \rightarrow \theta \)
Conclusion
\( \vdash \psi \wedge \chi \wedge \varphi \rightarrow \theta \)
Proof
3imp.1
com3l
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3imp
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