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Definition df-3o 6693
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 6686 . 2  class  3o
2 c2o 6685 . . 3  class  2o
32csuc 4551 . 2  class  suc  2o
41, 3wceq 1649 1  wff  3o  =  suc  2o
Colors of variables: wff set class
This definition is referenced by:  3on  6701  3onn  6851  en3  7312  hash3  11638
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