This is an inofficial mirror of http://metamath.tirix.org for personal testing of a visualizer extension only.

Metamath Proof Explorer

Theorem nfaba1OLD

Description: Obsolete version of nfaba1 as of 14-May-2025. (Contributed by Mario Carneiro, 14-Oct-2016) (Revised by GG, 20-Jan-2024) (Proof modification is discouraged.) (New usage is discouraged.)

Ref Expression
Assertion nfaba1OLD ⊢ Ⅎ _ x y | ∀ x φ

Proof

Step Hyp Ref Expression
1 nfa1 ⊢ Ⅎ x ∀ x φ
2 1 nfab ⊢ Ⅎ _ x y | ∀ x φ