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| Mirrors > Home > MPE Home > Th. List > Mathboxes > df-7o | Structured version Visualization version GIF version | ||
| Description: Define the ordinal number 7. (Contributed by BTernaryTau, 2-Sep-2026.) |
| Ref | Expression |
|---|---|
| df-7o | ⊢ 7o = suc 6o |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c7o 35688 | . 2 class 7o | |
| 2 | c6o 35687 | . . 3 class 6o | |
| 3 | 2 | csuc 6353 | . 2 class suc 6o |
| 4 | 1, 3 | wceq 1570 | 1 wff 7o = suc 6o |
| Colors of variables: wff setvar class |
| This definition is used by: 7on 35698 7onn 35703 |
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