Definition df-1o 7799

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 7792	. 2 class 1𝑜
2		c0 4123	. . 3 class ∅
3	2	csuc 5945	. 2 class suc ∅
4	1, 3	wceq 1637	1 wff 1𝑜 = suc ∅

This definition is referenced by:  1on  7806  df1o2  7812  ordgt0ge1  7817  oa1suc  7851  om1  7862  oe1  7864  oelim2  7915  nnecl  7933  1onn  7959  omabs  7967  nnm1  7968  0sdom1dom  8400  ackbij1lem14  9343  aleph1  9681  cfpwsdom  9694  nlt1pi  10016  indpi  10017  hash1  13412  aleph1re  15197  bnj168  31127  sltval2  32135  sltsolem1  32152  nosepnelem  32156  nolt02o  32171  rankeq1o  32604  finxp1o  33547  finxpreclem4  33549  finxp00  33557  clsk1indlem1  38844