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Definition df-4o 7523
Description: Define the ordinal number 4. (Contributed by Mario Carneiro, 14-Jul-2013.)
Assertion
Ref Expression
df-4o 4𝑜 = suc 3𝑜

Detailed syntax breakdown of Definition df-4o
StepHypRef Expression
1 c4o 7516 . 2 class 4𝑜
2 c3o 7515 . . 3 class 3𝑜
32csuc 5694 . 2 class suc 3𝑜
41, 3wceq 1480 1 wff 4𝑜 = suc 3𝑜
Colors of variables: wff setvar class
This definition is referenced by:  4on  7531  o2p2e4  7581  4onn  7682  en4  8158  hash4  13151
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