Definition df-4o 8517

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 8510	. 2 class 4o
2		c3o 8509	. . 3 class 3o
3	2	csuc 6390	. 2 class suc 3o
4	1, 3	wceq 1570	1 wff 4o = suc 3o

This definition is used by:  4on  8532  o2p2e4  8587  4onn  8692  en4  9311  hash4  14592  3olt9o  35919  gdlopcfv4  36016  gdlopcfv5  36017  gdlopcfv6  36018  gdlopcfv7  36019  gdlopcfv8  36020  nlim4  44707