Definition df-1o 6219

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 6212	. 2 class 1o
2		c0 3302	. . 3 class ∅
3	2	csuc 4216	. 2 class suc ∅
4	1, 3	wceq 1296	1 wff 1o = suc ∅

This definition is referenced by:  1on  6226  df1o2  6232  ordgt0ge1  6237  oa1suc  6268  1onn  6319  nnm1  6323  nlt1pig  6997  indpi  6998  1tonninf  9995  hash1  10350