| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > df-2 | Structured version Visualization version Unicode version | ||
| Description: Define the number 2. (Contributed by NM, 27-May-1999.) |
| Ref | Expression |
|---|---|
| df-2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c2 11070 |
. 2
| |
| 2 | c1 9937 |
. . 3
| |
| 3 | caddc 9939 |
. . 3
| |
| 4 | 2, 2, 3 | co 6650 |
. 2
|
| 5 | 1, 4 | wceq 1483 |
1
|
| Copyright terms: Public domain | W3C validator |