Theorem
simp121
Simplification of conjunction. (Contributed by NM, 9-Mar-2012.)
Conclusion
\( \vdash (\theta \wedge (\varphi \wedge \psi \wedge \chi) \wedge \tau) \wedge \eta \wedge \zeta \rightarrow \varphi \)
Proof
simp21
3ad2ant1
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