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Definition df-1o 5912
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 5905 . 2 class 1𝑜
2 c0 3197 . . 3 class
32csuc 4047 . 2 class suc ∅
41, 3wceq 1226 1 wff 1𝑜 = suc ∅
Colors of variables: wff set class
This definition is referenced by:  1on  5919  df1o2  5924  ordgt0ge1  5929  oa1suc  5958  1onn  6000  nnm1  6004  nlt1pig  6195
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