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| Mirrors > Home > MPE Home > Th. List > Mathboxes > df-8o | Structured version Visualization version GIF version | ||
| Description: Define the ordinal number 8. (Contributed by BTernaryTau, 2-Sep-2026.) |
| Ref | Expression |
|---|---|
| df-8o | ⊢ 8o = suc 7o |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c8o 35806 | . 2 class 8o | |
| 2 | c7o 35805 | . . 3 class 7o | |
| 3 | 2 | csuc 6364 | . 2 class suc 7o |
| 4 | 1, 3 | wceq 1569 | 1 wff 8o = suc 7o |
| Colors of variables: wff setvar class |
| This definition is used by: 8on 35816 8onn 35821 |
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