Definition df-1o 6577

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 6570	. 2 class 1o
2		c0 3492	. . 3 class (/)
3	2	csuc 4460	. 2 class suc (/)
4	1, 3	wceq 1395	1 wff 1o = suc (/)

This definition is referenced by:  1on  6584  df1o2  6591  ordgt0ge1  6598  oa1suc  6630  1onn  6683  nnm1  6688  nlt1pig  7551  indpi  7552  1tonninf  10693  hash1  11065  012of  16528  2o01f  16529  pwle2  16535  isomninnlem  16570  iswomninnlem  16589  ismkvnnlem  16592