Metamath Proof Explorer


Theorem bnj707

Description: /\ -manipulation. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.)

Ref Expression
Hypothesis bnj707.1 χ τ
Assertion bnj707 φ ψ χ θ τ

Proof

Step Hyp Ref Expression
1 bnj707.1 χ τ
2 bnj258 φ ψ χ θ φ ψ θ χ
3 2 simprbi φ ψ χ θ χ
4 3 1 syl φ ψ χ θ τ