Theorem nfa2 1559

Description: Lemma 24 of [Monk2] p. 114. (Contributed by Mario Carneiro, 24-Sep-2016.)

Assertion

Ref	Expression
nfa2	|- F/ x A. y A. x ph

Proof of Theorem nfa2

Step	Hyp	Ref	Expression
1		nfa1 1522	. 2 |- F/ x A. x ph
2	1	nfal 1556	1 |- F/ x A. y A. x ph

Syntax hints:   A.wal 1330   F/wnf 1437

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1424  ax-7 1425  ax-gen 1426  ax-4 1488  ax-ial 1515

This theorem depends on definitions:  df-bi 116  df-nf 1438

This theorem is referenced by:  cbv1h  1724  csbie2t  3053  copsex2t  4175  fnoprabg  5880