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Theorem hbnae 1895
Description: All variables are effectively bound in a distinct variable specifier. Lemma L19 in [Megill] p. 446 (p. 14 of the preprint). (Contributed by NM, 5-Aug-1993.)
Assertion
Ref Expression
hbnae  |-  ( -. 
A. x  x  =  y  ->  A. z  -.  A. x  x  =  y )

Proof of Theorem hbnae
StepHypRef Expression
1 hbae 1893 . 2  |-  ( A. x  x  =  y  ->  A. z A. x  x  =  y )
21hbn 1720 1  |-  ( -. 
A. x  x  =  y  ->  A. z  -.  A. x  x  =  y )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4   A.wal 1527
This theorem is referenced by:  hbnaes  1897  dvelimh  1904  eujustALT  2146  a9e2nd  28324  a9e2ndVD  28684  a9e2ndeqVD  28685  a9e2ndALT  28707  a9e2ndeqALT  28708  ax12-2  29103
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866
This theorem depends on definitions:  df-bi 177  df-an 360  df-ex 1529  df-nf 1532
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