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Metamath Proof Explorer
Description: The number 9 is nonzero. (Contributed by SN, 22-Oct-2025)
|
|
Ref |
Expression |
|
Assertion |
9ne0 |
|- 9 =/= 0 |
Proof
| Step |
Hyp |
Ref |
Expression |
| 1 |
|
9nn |
|- 9 e. NN |
| 2 |
1
|
nnne0i |
|- 9 =/= 0 |