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Definition df-1o 6163
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 6156 . 2  class  1o
2 c0 3284 . . 3  class  (/)
32csuc 4183 . 2  class  suc  (/)
41, 3wceq 1289 1  wff  1o  =  suc  (/)
Colors of variables: wff set class
This definition is referenced by:  1on  6170  df1o2  6176  ordgt0ge1  6181  oa1suc  6210  1onn  6259  nnm1  6263  nlt1pig  6879  indpi  6880  1tonninf  9811  hash1  10183
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