Theorem simp323

Simplification of conjunction. (Contributed by NM, 9-Mar-2012.)

Conclusion
\( \vdash \eta \wedge \zeta \wedge (\theta \wedge (\varphi \wedge \psi \wedge \chi) \wedge \tau) \rightarrow \chi \)
Proof
simp23
3ad2ant3 _