Definition df-3o 6527

Description: Define the ordinal number 3. (Contributed by Mario Carneiro, 14-Jul-2013.)

Assertion

Ref	Expression
df-3o	|- 3o = suc 2o

Detailed syntax breakdown of Definition df-3o

Step	Hyp	Ref	Expression
1		c3o 6520	. 2 class 3o
2		c2o 6519	. . 3 class 2o
3	2	csuc 4430	. 2 class suc 2o
4	1, 3	wceq 1373	1 wff 3o = suc 2o

This definition is referenced by:  3on  6536  3onn  6631  pw1ne3  7376  pw1nel3  7377  sucpw1nel3  7379  3nelsucpw1  7380  3nsssucpw1  7382  onntri35  7383  hash3  10995