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Definition df-1o 6313
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 6306 . 2  class  1o
2 c0 3363 . . 3  class  (/)
32csuc 4287 . 2  class  suc  (/)
41, 3wceq 1331 1  wff  1o  =  suc  (/)
Colors of variables: wff set class
This definition is referenced by:  1on  6320  df1o2  6326  ordgt0ge1  6332  oa1suc  6363  1onn  6416  nnm1  6420  nlt1pig  7156  indpi  7157  1tonninf  10220  hash1  10564  pwle2  13207  isomninnlem  13239
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