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Definition df-4o 8507
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 8500 . 2 class 4o
2 c3o 8499 . . 3 class 3o
32csuc 6387 . 2 class suc 3o
41, 3wceq 1536 1 wff 4o = suc 3o
Colors of variables: wff setvar class
This definition is referenced by:  4on  8523  o2p2e4  8577  4onn  8681  en4  9314  hash4  14442  nlim4  43434
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