Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
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 5994 | . 2 class 1𝑜 | |
2 | c0 3224 | . . 3 class ∅ | |
3 | 2 | csuc 4102 | . 2 class suc ∅ |
4 | 1, 3 | wceq 1243 | 1 wff 1𝑜 = suc ∅ |
Colors of variables: wff set class |
This definition is referenced by: 1on 6008 df1o2 6013 ordgt0ge1 6018 oa1suc 6047 1onn 6093 nnm1 6097 nlt1pig 6439 indpi 6440 |
Copyright terms: Public domain | W3C validator |