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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 = {x ∣ Ord x}

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