Metamath Proof Explorer


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