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| Mirrors > Home > MPE Home > Th. List > df-3 | Structured version Visualization version Unicode version | ||
| Description: Define the number 3. (Contributed by NM, 27-May-1999.) |
| Ref | Expression |
|---|---|
| df-3 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c3 11071 |
. 2
| |
| 2 | c2 11070 |
. . 3
| |
| 3 | c1 9937 |
. . 3
| |
| 4 | caddc 9939 |
. . 3
| |
| 5 | 2, 3, 4 | co 6650 |
. 2
|
| 6 | 1, 5 | wceq 1483 |
1
|
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