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Theorem ax7dgen 1730
Description: Degenerate instance of ax-7 1745 where bundled variables  x and  y have a common substitution. Uses only Tarski's FOL axiom schemes. (Contributed by NM, 13-Apr-2017.)
Ref Expression
ax7dgen  |-  ( A. x A. x ph  ->  A. x A. x ph )

Proof of Theorem ax7dgen
StepHypRef Expression
1 id 20 1  |-  ( A. x A. x ph  ->  A. x A. x ph )
Colors of variables: wff set class
Syntax hints:    -> wi 4   A.wal 1546
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 8
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