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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 12028 | . 2 class 2 | |
2 | c1 10872 | . . 3 class 1 | |
3 | caddc 10874 | . . 3 class + | |
4 | 2, 2, 3 | co 7275 | . 2 class (1 + 1) |
5 | 1, 4 | wceq 1539 | 1 wff 2 = (1 + 1) |
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