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| Mirrors > Home > MPE Home > Th. List > Mathboxes > df-5o | Structured version Visualization version GIF version | ||
| Description: Define the ordinal number 5. (Contributed by BTernaryTau, 2-Sep-2026.) |
| Ref | Expression |
|---|---|
| df-5o | ⊢ 5o = suc 4o |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c5o 35686 | . 2 class 5o | |
| 2 | c4o 8450 | . . 3 class 4o | |
| 3 | 2 | csuc 6353 | . 2 class suc 4o |
| 4 | 1, 3 | wceq 1570 | 1 wff 5o = suc 4o |
| Colors of variables: wff setvar class |
| This definition is used by: 5on 35696 5onn 35701 |
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