Definition df-1o 6163

Description: Define the ordinal number 1. (Contributed by NM, 29-Oct-1995.)

Assertion

Ref	Expression
df-1o	|- 1o = suc (/)

Detailed syntax breakdown of Definition df-1o

Step	Hyp	Ref	Expression
1		c1o 6156	. 2 class 1o
2		c0 3284	. . 3 class (/)
3	2	csuc 4183	. 2 class suc (/)
4	1, 3	wceq 1289	1 wff 1o = suc (/)

This definition is referenced by:  1on  6170  df1o2  6176  ordgt0ge1  6181  oa1suc  6210  1onn  6259  nnm1  6263  nlt1pig  6879  indpi  6880  1tonninf  9811  hash1  10183