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Mirrors > Home > ILE Home > Th. List > df-2o | Unicode version |
Description: Define the ordinal number 2. (Contributed by NM, 18-Feb-2004.) |
Ref | Expression |
---|---|
df-2o |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | c2o 6018 | . 2 | |
2 | c1o 6017 | . . 3 | |
3 | 2 | csuc 4120 | . 2 |
4 | 1, 3 | wceq 1284 | 1 |
Colors of variables: wff set class |
This definition is referenced by: 2on 6032 2on0 6033 df2o3 6037 o1p1e2 6071 2onn 6117 nnm2 6121 snnen2og 6345 1nen2 6347 pm54.43 6459 prarloclemarch2 6609 prarloclemlt 6683 prarloclemn 6689 |
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