Theorem
3adant3r2
Deduction adding a conjunct to antecedent. (Contributed by NM, 17-Feb-2008.)
Hypothesis
ad4ant3.1
\( \vdash \varphi \wedge \psi \wedge \chi \rightarrow \theta \)
Conclusion
\( \vdash \varphi \wedge (\psi \wedge \tau \wedge \chi) \rightarrow \theta \)
Proof
ad4ant3.1
3expb
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3adantr2
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