Metamath Proof Explorer


Theorem merco1lem7

Description: Used to rederive the Tarski-Bernays-Wajsberg axioms from merco1 . (Contributed by Anthony Hart, 17-Sep-2011) (Proof modification is discouraged.) (New usage is discouraged.)

Ref Expression
Assertion merco1lem7 φ ψ χ ψ ψ

Proof

Step Hyp Ref Expression
1 merco1lem5 ψ ψ χ ψ χ ψ χ
2 merco1 ψ ψ χ ψ χ ψ χ ψ χ ψ ψ χ ψ ψ
3 1 2 ax-mp ψ χ ψ ψ χ ψ ψ
4 merco1lem6 ψ χ ψ ψ χ ψ ψ φ ψ χ ψ ψ
5 3 4 ax-mp φ ψ χ ψ ψ