Definition df-2o 6442

Description: Define the ordinal number 2. (Contributed by NM, 18-Feb-2004.)

Assertion

Ref	Expression
df-2o	|- 2o = suc 1o

Detailed syntax breakdown of Definition df-2o

Step	Hyp	Ref	Expression
1		c2o 6435	. 2 class 2o
2		c1o 6434	. . 3 class 1o
3	2	csuc 4383	. 2 class suc 1o
4	1, 3	wceq 1364	1 wff 2o = suc 1o

This definition is referenced by:  2on  6450  2on0  6451  df2o3  6455  o1p1e2  6493  2onn  6546  nnm2  6551  enpr2d  6843  snnen2og  6887  1nen2  6889  pm54.43  7219  en2eleq  7224  en2other2  7225  exmidfodomrlemr  7231  exmidfodomrlemrALT  7232  prarloclemarch2  7448  prarloclemlt  7522  prarloclemn  7528  hash2  10824  bj-el2oss1o  14987  pwle2  15210  nnsf  15216