Theorem nfae 1743

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 1742	. 2 |- ( A. x x = y -> A. z A. x x = y )
2	1	nfi 1486	1 |- F/ z A. x x = y

Syntax hints:   A.wal 1371   F/wnf 1484

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-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558

This theorem depends on definitions:  df-bi 117  df-nf 1485

This theorem is referenced by:  nfnae  1746  sbequ5  1806  a16nf  1890  dvelimfv  2040  dvelimor  2047  copsexg  4306