Theorem simpll2

Simplification of conjunction. (Contributed by NM, 9-Mar-2012.) (Proof shortened by Wolf Lammen, 23-Jun-2022.)

Conclusion

\( \vdash (\varphi \wedge \psi \wedge \chi) \wedge \theta \wedge \tau \rightarrow \psi \)

Proof

simp2

ad2antrr _