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| Mirrors > Home > ILE Home > Th. List > df-3o | Unicode version | ||
| Description: Define the ordinal number 3. (Contributed by Mario Carneiro, 14-Jul-2013.) |
| Ref | Expression |
|---|---|
| df-3o |
     |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c3o 6686 |
. 2
 | |
| 2 | c2o 6685 |
. . 3
| |
| 3 | 2 | csuc 4512 |
. 2
|
| 4 | 1, 3 | wceq 1402 |
1
 |
| Colors of variables: wff set class |
| This definition is used by: 3on 6702 3onn 6799 pw1ne3 7595 pw1nel3 7596 sucpw1nel3 7598 3nelsucpw1 7599 3nsssucpw1 7601 onntri35 7602 hash3 11276 3dom 17223 |
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