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| Mirrors > Home > MPE Home > Th. List > Mathboxes > df-9o | Structured version Visualization version GIF version | ||
| Description: Define the ordinal number 9. (Contributed by BTernaryTau, 2-Sep-2026.) |
| Ref | Expression |
|---|---|
| df-9o | ⊢ 9o = suc 8o |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c9o 35690 | . 2 class 9o | |
| 2 | c8o 35689 | . . 3 class 8o | |
| 3 | 2 | csuc 6353 | . 2 class suc 8o |
| 4 | 1, 3 | wceq 1570 | 1 wff 9o = suc 8o |
| Colors of variables: wff setvar class |
| This definition is used by: 9on 35700 9onn 35705 |
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