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Axiom ax-9d1 2236
Description: Distinct varable version of ax9 1889, variables equal case. (Contributed by Mario Carneiro, 14-Aug-2015.)
Assertion
Ref Expression
ax-9d1  |-  -.  A. x  -.  x  =  x

Detailed syntax breakdown of Axiom ax-9d1
StepHypRef Expression
1 vx . . . . 5  set  x
21, 1weq 1624 . . . 4  wff  x  =  x
32wn 3 . . 3  wff  -.  x  =  x
43, 1wal 1527 . 2  wff  A. x  -.  x  =  x
54wn 3 1  wff  -.  A. x  -.  x  =  x
Colors of variables: wff set class
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