Metamath Proof Explorer

Theorem mobiiOLD

Description: Obsolete version of mobii as of 24-Sep-2023. (Contributed by NM, 9-Mar-1995) (Revised by Mario Carneiro, 17-Oct-2016) (Proof modification is discouraged.) (New usage is discouraged.)

Ref Expression
Hypothesis mobii.1 ψ χ
Assertion mobiiOLD * x ψ * x χ


Step Hyp Ref Expression
1 mobii.1 ψ χ
2 mobi x ψ χ * x ψ * x χ
3 2 1 mpg * x ψ * x χ