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Definition df-1o 6135
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 6128 . 2 class 1𝑜
2 c0 3275 . . 3 class
32csuc 4166 . 2 class suc ∅
41, 3wceq 1287 1 wff 1𝑜 = suc ∅
Colors of variables: wff set class
This definition is referenced by:  1on  6142  df1o2  6148  ordgt0ge1  6153  oa1suc  6182  1onn  6231  nnm1  6235  nlt1pig  6844  indpi  6845  1tonninf  9774  hash1  10116
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