Metamath Proof Explorer

Theorem simp21r

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

		Ref	Expression
	Assertion	simp21r	$⊢ (τ \land ((φ \land ψ) \land χ \land θ) \land η) \to ψ$

Step	Hyp	Ref	Expression
1		simp1r	$⊢ ((φ \land ψ) \land χ \land θ) \to ψ$
2	1	3ad2ant2	$⊢ (τ \land ((φ \land ψ) \land χ \land θ) \land η) \to ψ$