Theorem 3adant2

Deduction adding a conjunct to antecedent. (Contributed by NM, 16-Jul-1995.)

Hypothesis
3adant.1
\( \vdash \varphi \wedge \psi \rightarrow \chi \)
Conclusion
\( \vdash \varphi \wedge \theta \wedge \psi \rightarrow \chi \)
Proof
3adant.1
adantlr _
3impa _