Definition df-4o 8088

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 8081	. 2 class 4o
2		c3o 8080	. . 3 class 3o
3	2	csuc 6161	. 2 class suc 3o
4	1, 3	wceq 1538	1 wff 4o = suc 3o

This definition is referenced by:  4on  8098  o2p2e4  8149  o2p2e4OLD  8150  4onn  8251  en4  8740  hash4  13764