Definition df-9o

Description: Define the ordinal number 9. (Contributed by BTernaryTau, 2-Sep-2026)

	Ref	Expression
Assertion	df-9o	Could not format assertion : No typesetting found for |- 9o = suc 8o with typecode |-

Detailed syntax breakdown

Step	Hyp	Ref	Expression
0		c9o	Could not format 9o : No typesetting found for class 9o with typecode class
1		c8o	Could not format 8o : No typesetting found for class 8o with typecode class
2	1	csuc	Could not format suc 8o : No typesetting found for class suc 8o with typecode class
3	0 2	wceq	Could not format 9o = suc 8o : No typesetting found for wff 9o = suc 8o with typecode wff