Theorem simpl2l

Description: Simplification of conjunction. (Contributed by NM, 9-Mar-2012) (Proof shortened by Wolf Lammen, 23-Jun-2022)

	Ref	Expression
Assertion	simpl2l	$$⊢\left(\left(\chi \wedge \left(\phi \wedge \psi \right)\wedge \theta \right)\wedge \tau \right)\to \phi$$

Proof

Step	Hyp	Ref	Expression
1		simpll	$$⊢\left(\left(\phi \wedge \psi \right)\wedge \tau \right)\to \phi$$
2	1	3ad2antl2	$$⊢\left(\left(\chi \wedge \left(\phi \wedge \psi \right)\wedge \theta \right)\wedge \tau \right)\to \phi$$