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Definition df-1o 6279
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 6272 . 2 class 1o
2 c0 3331 . . 3 class
32csuc 4255 . 2 class suc ∅
41, 3wceq 1314 1 wff 1o = suc ∅
Colors of variables: wff set class
This definition is referenced by:  1on  6286  df1o2  6292  ordgt0ge1  6298  oa1suc  6329  1onn  6382  nnm1  6386  nlt1pig  7113  indpi  7114  1tonninf  10164  hash1  10508  pwle2  13027  isomninnlem  13059
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