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Theorem ax12dgen4 1702
Description: Degenerate instance of ax-12 1866 where bundled variables  x,  y, and  z have a common substitution. Uses only Tarski's FOL axiom schemes . (Contributed by NM, 13-Apr-2017.)
Assertion
Ref Expression
ax12dgen4  |-  ( -.  x  =  x  -> 
( x  =  x  ->  A. x  x  =  x ) )

Proof of Theorem ax12dgen4
StepHypRef Expression
1 ax12dgen1 1699 1  |-  ( -.  x  =  x  -> 
( x  =  x  ->  A. x  x  =  x ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4   A.wal 1527
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
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