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Theorem ax12dgen3 1713
Description: Degenerate instance of ax-12 1878 where bundled variables  y and  z have a common substitution. Uses only Tarski's FOL axiom schemes. (Contributed by NM, 13-Apr-2017.)
Assertion
Ref Expression
ax12dgen3  |-  ( -.  x  =  y  -> 
( y  =  y  ->  A. x  y  =  y ) )

Proof of Theorem ax12dgen3
StepHypRef Expression
1 equid 1662 . . 3  |-  y  =  y
21ax-gen 1536 . 2  |-  A. x  y  =  y
32a1ii 24 1  |-  ( -.  x  =  y  -> 
( y  =  y  ->  A. x  y  =  y ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4   A.wal 1530
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661
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