Theorem nfna1

Description: A convenience theorem particularly designed to remove dependencies on ax-11 in conjunction with distinctors. (Contributed by Wolf Lammen, 2-Sep-2018)

	Ref	Expression
Assertion	nfna1	|- F/ x -. A. x ph

Proof

Step	Hyp	Ref	Expression
1		nfa1	|- F/ x A. x ph
2	1	nfn	|- F/ x -. A. x ph