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Mirrors > Home > ILE Home > Th. List > df-1o | GIF version |
Description: Define the ordinal number 1. (Contributed by NM, 29-Oct-1995.) |
Ref | Expression |
---|---|
df-1o | ⊢ 1o = suc ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | c1o 6306 | . 2 class 1o | |
2 | c0 3363 | . . 3 class ∅ | |
3 | 2 | csuc 4287 | . 2 class suc ∅ |
4 | 1, 3 | wceq 1331 | 1 wff 1o = suc ∅ |
Colors of variables: wff set class |
This definition is referenced by: 1on 6320 df1o2 6326 ordgt0ge1 6332 oa1suc 6363 1onn 6416 nnm1 6420 nlt1pig 7149 indpi 7150 1tonninf 10213 hash1 10557 pwle2 13193 isomninnlem 13225 |
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