Definition df-on 2948

Description: Define the class of all ordinal numbers. Definition 7.11 of [TakeutiZaring] p. 38.

Assertion

Ref	Expression
df-on	|- On = {x | Ord x}

Detailed syntax breakdown of Definition df-on

Step	Hyp	Ref	Expression
1		con0 2944	. 2 class On
2		vx	. . . . 5 set x
3	2	cv 954	. . . 4 class x
4	3	word 2943	. . 3 wff Ord x
5	4, 2	cab 1462	. 2 class {x | Ord x}
6	1, 5	wceq 955	1 wff On = {x | Ord x}

This definition is referenced by:  elong 2952

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