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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 6555 |
. 2
 | |
| 2 | c2o 6554 |
. . 3
| |
| 3 | 2 | csuc 4455 |
. 2
|
| 4 | 1, 3 | wceq 1395 |
1
 |
| Colors of variables: wff set class |
| This definition is referenced by: 3on 6571 3onn 6666 pw1ne3 7411 pw1nel3 7412 sucpw1nel3 7414 3nelsucpw1 7415 3nsssucpw1 7417 onntri35 7418 hash3 11030 |
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