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