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Axiom ax-9d2 2250
Description: Distinct variable version of ax9 1902, distinct variables case. (Contributed by Mario Carneiro, 14-Aug-2015.)
Assertion
Ref Expression
ax-9d2  |-  -.  A. x  -.  x  =  y
Distinct variable group:    x, y

Detailed syntax breakdown of Axiom ax-9d2
StepHypRef Expression
1 vx . . . . 5  set  x
2 vy . . . . 5  set  y
31, 2weq 1633 . . . 4  wff  x  =  y
43wn 3 . . 3  wff  -.  x  =  y
54, 1wal 1530 . 2  wff  A. x  -.  x  =  y
65wn 3 1  wff  -.  A. x  -.  x  =  y
Colors of variables: wff set class
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