Theorem
simp312
Simplification of conjunction. (Contributed by NM, 9-Mar-2012.)
Conclusion
\( \vdash \eta \wedge \zeta \wedge ((\varphi \wedge \psi \wedge \chi) \wedge \theta \wedge \tau) \rightarrow \psi \)
Proof
simp12
3ad2ant3
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