Theorem 8on

Description: Ordinal 8 is an ordinal number. (Contributed by BTernaryTau, 4-Sep-2026)

	Ref	Expression
Assertion	8on	Could not format assertion : No typesetting found for |- 8o e. On with typecode |-

Proof

Step	Hyp	Ref	Expression
1		df-8o	Could not format 8o = suc 7o : No typesetting found for |- 8o = suc 7o with typecode |-
2		7on	Could not format 7o e. On : No typesetting found for |- 7o e. On with typecode |-
3	2	onsuci	Could not format suc 7o e. On : No typesetting found for |- suc 7o e. On with typecode |-
4	1 3	eqeltri	Could not format 8o e. On : No typesetting found for |- 8o e. On with typecode |-