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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 6019 |
. 2
 | |
| 2 | c2o 6018 |
. . 3
| |
| 3 | 2 | csuc 4120 |
. 2
|
| 4 | 1, 3 | wceq 1284 |
1
 |
| Colors of variables: wff set class |
| This definition is referenced by: 3on 6034 3onn 6118 |
| Copyright terms: Public domain | W3C validator |