Theorem a4i 680

Description: Inference rule reversing generalization.

Hypothesis

Ref	Expression
a4i.1	⊢ ∀xφ

Assertion

Ref	Expression
a4i	⊢ φ

Proof of Theorem a4i

Step	Hyp	Ref	Expression
1		a4i.1	. 2 ⊢ ∀xφ
2		ax-4 673	. 2 ⊢ (∀xφ → φ)
3	1, 2	ax-mp 6	1 ⊢ φ

Syntax hints:  ∀wal 672

This theorem is referenced by:  ersym 3209  ertr 3211  ac7 3569  ac4 3571  ac5 3573  ac8 3579  kmlem2 3581

This theorem was proved from axioms:  ax-mp 6  ax-4 673

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