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| Mirrors > Home > MPE Home > Th. List > df-3 | Structured version Visualization version GIF version | ||
| Description: Define the number 3. (Contributed by NM, 27-May-1999.) |
| Ref | Expression |
|---|---|
| df-3 | ⊢ 3 = (2 + 1) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c3 12322 | . 2 class 3 | |
| 2 | c2 12321 | . . 3 class 2 | |
| 3 | c1 11156 | . . 3 class 1 | |
| 4 | caddc 11158 | . . 3 class + | |
| 5 | 2, 3, 4 | co 7431 | . 2 class (2 + 1) |
| 6 | 1, 5 | wceq 1540 | 1 wff 3 = (2 + 1) |
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