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Definition df-3o 6034
Description: Define the ordinal number 3. (Contributed by Mario Carneiro, 14-Jul-2013.)
Assertion
Ref Expression
df-3o  |-  3o  =  suc  2o

Detailed syntax breakdown of Definition df-3o
StepHypRef Expression
1 c3o 6027 . 2  class  3o
2 c2o 6026 . . 3  class  2o
32csuc 4130 . 2  class  suc  2o
41, 3wceq 1259 1  wff  3o  =  suc  2o
Colors of variables: wff set class
This definition is referenced by:  3on  6042  3onn  6126
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