Definition df-1o 6031

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 6024	. 2 class 1o
2		c0 3251	. . 3 class (/)
3	2	csuc 4129	. 2 class suc (/)
4	1, 3	wceq 1259	1 wff 1o = suc (/)

This definition is referenced by:  1on  6038  df1o2  6043  ordgt0ge1  6048  oa1suc  6077  1onn  6123  nnm1  6127  nlt1pig  6496  indpi  6497