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Definition df-1o 6086
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 6079 . 2  class  1o
2 c0 3267 . . 3  class  (/)
32csuc 4148 . 2  class  suc  (/)
41, 3wceq 1285 1  wff  1o  =  suc  (/)
Colors of variables: wff set class
This definition is referenced by:  1on  6093  df1o2  6098  ordgt0ge1  6103  oa1suc  6132  1onn  6181  nnm1  6185  nlt1pig  6663  indpi  6664  hash1  9905
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