Definition df-4o 8401

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 8394	. 2 class 4o
2		c3o 8393	. . 3 class 3o
3	2	csuc 6319	. 2 class suc 3o
4	1, 3	wceq 1542	1 wff 4o = suc 3o

This definition is referenced by:  4on  8415  o2p2e4  8469  4onn  8574  en4  9185  hash4  14360  nlim4  43890