Theorem nfae 1707

Description: All variables are effectively bound in an identical variable specifier. (Contributed by Mario Carneiro, 11-Aug-2016.)

Assertion

Ref	Expression
nfae	|- F/ z A. x x = y

Proof of Theorem nfae

Step	Hyp	Ref	Expression
1		hbae 1706	. 2 |- ( A. x x = y -> A. z A. x x = y )
2	1	nfi 1450	1 |- F/ z A. x x = y

Syntax hints:   A.wal 1341   F/wnf 1448

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-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522

This theorem depends on definitions:  df-bi 116  df-nf 1449

This theorem is referenced by:  nfnae  1710  sbequ5  1770  a16nf  1854  dvelimfv  1999  dvelimor  2006  copsexg  4222