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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 12029 | . 2 class 3 | |
2 | c2 12028 | . . 3 class 2 | |
3 | c1 10872 | . . 3 class 1 | |
4 | caddc 10874 | . . 3 class + | |
5 | 2, 3, 4 | co 7275 | . 2 class (2 + 1) |
6 | 1, 5 | wceq 1539 | 1 wff 3 = (2 + 1) |
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