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