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Theorem ax12vX 28281
Description: A weaker version of ax-12 1633 with distinct variable restrictions on pairs  x ,  z and  y ,  z. In order to show that this weakening is adequate, this should be the only theorem referencing ax-12 1633 directly. (Contributed by NM, 30-Jun-2016.)
Assertion
Ref Expression
ax12vX  |-  ( -.  x  =  y  -> 
( y  =  z  ->  A. x  y  =  z ) )
Distinct variable groups:    x, z    y, z

Proof of Theorem ax12vX
StepHypRef Expression
1 ax-12 1633 1  |-  ( -.  x  =  y  -> 
( y  =  z  ->  A. x  y  =  z ) )
Colors of variables: wff set class
Syntax hints:   -. wn 5    -> wi 6   A.wal 1532
This theorem was proved from axioms:  ax-12 1633
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