Theorem 3adant3

Deduction adding a conjunct to antecedent. (Contributed by NM, 16-Jul-1995.) (Proof shortened by Wolf Lammen, 21-Jun-2022.)

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