Metamath Proof Explorer


Definition df-6o

Description: Define the ordinal number 6. (Contributed by BTernaryTau, 2-Sep-2026)

Ref Expression
Assertion df-6o 6o = suc 5o

Detailed syntax breakdown

Step Hyp Ref Expression
0 c6o ⊢ 6o
1 c5o ⊢ 5o
2 1 csuc ⊢ suc 5o
3 0 2 wceq ⊢ 6o = suc 5o