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Metamath Proof Explorer
Definition df-9
Description: Define the number 9. (Contributed by NM, 27-May-1999)
|
|
Ref |
Expression |
|
Assertion |
df-9 |
⊢ 9 = ( 8 + 1 ) |
Detailed syntax breakdown
| Step |
Hyp |
Ref |
Expression |
| 0 |
|
c9 |
⊢ 9 |
| 1 |
|
c8 |
⊢ 8 |
| 2 |
|
caddc |
⊢ + |
| 3 |
|
c1 |
⊢ 1 |
| 4 |
1 3 2
|
co |
⊢ ( 8 + 1 ) |
| 5 |
0 4
|
wceq |
⊢ 9 = ( 8 + 1 ) |