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| Description: Define the class of all ordinal numbers. Definition 7.11 of [TakeutiZaring] p. 38. |
| Ref | Expression |
|---|---|
| df-on |
        |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | con0 2938 |
. 2
 | |
| 2 | vx |
. . . . 5
 | |
| 3 | 2 | cv 952 |
. . . 4
|
| 4 | 3 | word 2937 |
. . 3
 |
| 5 | 4, 2 | cab 1456 |
. 2
|
| 6 | 1, 5 | wceq 953 |
1
|
| Colors of variables: wff set class |
| This definition is referenced by: elong 2946 |