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Metamath Proof Explorer
Definition df-2o
Description: Define the ordinal number 2. Lemma 3.17 of Schloeder p. 10.
(Contributed by NM, 18-Feb-2004)
|
|
Ref |
Expression |
|
Assertion |
df-2o |
⊢ 2o = suc 1o |
Detailed syntax breakdown
| Step |
Hyp |
Ref |
Expression |
| 0 |
|
c2o |
⊢ 2o |
| 1 |
|
c1o |
⊢ 1o |
| 2 |
1
|
csuc |
⊢ suc 1o |
| 3 |
0 2
|
wceq |
⊢ 2o = suc 1o |