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Axiom ax-nul 4431
Description: The Null Set Axiom of ZF set theory. It was derived as axnul 4430 above and is therefore redundant, but we state it as a separate axiom here so that its uses can be identified more easily. (Contributed by NM, 7-Aug-2003.)
Assertion
Ref Expression
ax-nul
Distinct variable group:   ,

Detailed syntax breakdown of Axiom ax-nul
StepHypRef Expression
1 vy . . . . 5
2 vx . . . . 5
31, 2wel 1725 . . . 4
43wn 3 . . 3
54, 1wal 1556 . 2
65, 2wex 1557 1
Colors of variables: wff set class
This axiom is referenced by:  0ex  4432  dtru  4490
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