Definition df-7o

Description: Define the ordinal number 7. (Contributed by BTernaryTau, 2-Sep-2026)

	Ref	Expression
Assertion	df-7o	⊢ 7o = suc 6o

Detailed syntax breakdown

Step	Hyp	Ref	Expression
0		c7o	⊢ 7o
1		c6o	⊢ 6o
2	1	csuc	⊢ suc 6o
3	0 2	wceq	⊢ 7o = suc 6o