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Definition df-1o 6001
Description: Define the ordinal number 1. (Contributed by NM, 29-Oct-1995.)
Assertion
Ref Expression
df-1o 1𝑜 = suc ∅

Detailed syntax breakdown of Definition df-1o
StepHypRef Expression
1 c1o 5994 . 2 class 1𝑜
2 c0 3224 . . 3 class
32csuc 4102 . 2 class suc ∅
41, 3wceq 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  6437  indpi  6438
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