Definition df-4o 8509

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

Step	Hyp	Ref	Expression
1		c4o 8502	. 2 class 4o
2		c3o 8501	. . 3 class 3o
3	2	csuc 6386	. 2 class suc 3o
4	1, 3	wceq 1540	1 wff 4o = suc 3o

This definition is referenced by:  4on  8525  o2p2e4  8579  4onn  8683  en4  9317  hash4  14446  nlim4  43458