Definition df-3o 6362

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 6355	. 2 class 3o
2		c2o 6354	. . 3 class 2o
3	2	csuc 4325	. 2 class suc 2o
4	1, 3	wceq 1335	1 wff 3o = suc 2o

This definition is referenced by:  3on  6371  3onn  6466  pw1ne3  7159  pw1nel3  7160  sucpw1nel3  7162  3nelsucpw1  7163  3nsssucpw1  7165  onntri35  7166  hash3  10680