Definition df-1o 6086

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 6079	. 2 class 1o
2		c0 3267	. . 3 class (/)
3	2	csuc 4148	. 2 class suc (/)
4	1, 3	wceq 1285	1 wff 1o = suc (/)

This definition is referenced by:  1on  6093  df1o2  6098  ordgt0ge1  6103  oa1suc  6132  1onn  6181  nnm1  6185  nlt1pig  6663  indpi  6664  hash1  9905