Theorem nfa2 1605

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

Assertion

Ref	Expression
nfa2	⊢ Ⅎ𝑥∀𝑦∀𝑥𝜑

Proof of Theorem nfa2

Step	Hyp	Ref	Expression
1		nfa1 1567	. 2 ⊢ Ⅎ𝑥∀𝑥𝜑
2	1	nfal 1602	1 ⊢ Ⅎ𝑥∀𝑦∀𝑥𝜑

Syntax hints:  ∀wal 1373  Ⅎwnf 1486

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1473  ax-7 1474  ax-gen 1475  ax-ial 1560

This theorem depends on definitions:  df-bi 117  df-nf 1487

This theorem is referenced by:  cbv1h  1772  csbie2t  3153  copsex2t  4310  fnoprabg  6076