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Definition df-on 4694
Description: Define the class of all ordinal numbers. Definition 7.11 of [TakeutiZaring] p. 38. (Contributed by NM, 5-Jun-1994.)
Assertion
Ref Expression
df-on

Detailed syntax breakdown of Definition df-on
StepHypRef Expression
1 con0 4690 . 2
2 vx . . . . 5
32cv 1686 . . . 4
43word 4689 . . 3
54, 2cab 2408 . 2
61, 5wceq 1687 1
Colors of variables: wff setvar class
This definition is referenced by:  elong  4698  dfon2  27307
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