Theorem simpl23

Simplification of conjunction. (Contributed by NM, 9-Mar-2012.) (Proof shortened by Wolf Lammen, 24-Jun-2022.)

Conclusion

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

Proof

simpl3

3ad2antl2 _