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Definition df-1o 6281
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 6274 . 2 class 1o
2 c0 3333 . . 3 class
32csuc 4257 . 2 class suc ∅
41, 3wceq 1316 1 wff 1o = suc ∅
Colors of variables: wff set class
This definition is referenced by:  1on  6288  df1o2  6294  ordgt0ge1  6300  oa1suc  6331  1onn  6384  nnm1  6388  nlt1pig  7117  indpi  7118  1tonninf  10168  hash1  10512  pwle2  13089  isomninnlem  13121
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