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Theorem axext4dist 25429
Description: axext4 2421 with distinctors instead of distinct variable restrictions. (Contributed by Scott Fenton, 13-Dec-2010.)
Assertion
Ref Expression
axext4dist  |-  ( ( -.  A. z  z  =  x  /\  -.  A. z  z  =  y )  ->  ( x  =  y  <->  A. z ( z  e.  x  <->  z  e.  y ) ) )

Proof of Theorem axext4dist
StepHypRef Expression
1 ax12o 2011 . . . 4  |-  ( -. 
A. z  z  =  x  ->  ( -.  A. z  z  =  y  ->  ( x  =  y  ->  A. z  x  =  y )
) )
21imp 420 . . 3  |-  ( ( -.  A. z  z  =  x  /\  -.  A. z  z  =  y )  ->  ( x  =  y  ->  A. z  x  =  y )
)
3 nfnae 2045 . . . . 5  |-  F/ z  -.  A. z  z  =  x
4 nfnae 2045 . . . . 5  |-  F/ z  -.  A. z  z  =  y
53, 4nfan 1847 . . . 4  |-  F/ z ( -.  A. z 
z  =  x  /\  -.  A. z  z  =  y )
6 elequ2 1731 . . . . 5  |-  ( x  =  y  ->  (
z  e.  x  <->  z  e.  y ) )
76a1i 11 . . . 4  |-  ( ( -.  A. z  z  =  x  /\  -.  A. z  z  =  y )  ->  ( x  =  y  ->  ( z  e.  x  <->  z  e.  y ) ) )
85, 7alimd 1781 . . 3  |-  ( ( -.  A. z  z  =  x  /\  -.  A. z  z  =  y )  ->  ( A. z  x  =  y  ->  A. z ( z  e.  x  <->  z  e.  y ) ) )
92, 8syld 43 . 2  |-  ( ( -.  A. z  z  =  x  /\  -.  A. z  z  =  y )  ->  ( x  =  y  ->  A. z
( z  e.  x  <->  z  e.  y ) ) )
10 axextdist 25428 . 2  |-  ( ( -.  A. z  z  =  x  /\  -.  A. z  z  =  y )  ->  ( A. z ( z  e.  x  <->  z  e.  y )  ->  x  =  y ) )
119, 10impbid 185 1  |-  ( ( -.  A. z  z  =  x  /\  -.  A. z  z  =  y )  ->  ( x  =  y  <->  A. z ( z  e.  x  <->  z  e.  y ) ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    <-> wb 178    /\ wa 360   A.wal 1550
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1556  ax-5 1567  ax-17 1627  ax-9 1667  ax-8 1688  ax-13 1728  ax-14 1730  ax-6 1745  ax-7 1750  ax-11 1762  ax-12 1951  ax-ext 2418
This theorem depends on definitions:  df-bi 179  df-an 362  df-tru 1329  df-ex 1552  df-nf 1555  df-cleq 2430  df-clel 2433  df-nfc 2562
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