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Definition df-4o 8096
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 8089 . 2 class 4o
2 c3o 8088 . . 3 class 3o
32csuc 6191 . 2 class suc 3o
41, 3wceq 1530 1 wff 4o = suc 3o
Colors of variables: wff setvar class
This definition is referenced by:  4on  8106  o2p2e4  8157  4onn  8258  en4  8745  hash4  13758
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