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Definition df-on 4071
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  On  {  |  Ord  }

Detailed syntax breakdown of Definition df-on
StepHypRef Expression
1 con0 4066 . 2  On
2 vx . . . . 5  setvar
32cv 1241 . . . 4
43word 4065 . . 3  Ord
54, 2cab 2023 . 2  {  |  Ord  }
61, 5wceq 1242 1  On  {  |  Ord  }
Colors of variables: wff set class
This definition is referenced by:  elong  4076  ordon  4178
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