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Definition df-3o 6067
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 6060 . 2 class 3𝑜
2 c2o 6059 . . 3 class 2𝑜
32csuc 4128 . 2 class suc 2𝑜
41, 3wceq 1285 1 wff 3𝑜 = suc 2𝑜
Colors of variables: wff set class
This definition is referenced by:  3on  6075  3onn  6161  size3  9837
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