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Metamath Proof Explorer
Description: The number 4 is nonzero. (Contributed by David A. Wheeler, 5-Dec-2018)
|
|
Ref |
Expression |
|
Assertion |
4ne0 |
|- 4 =/= 0 |
Proof
| Step |
Hyp |
Ref |
Expression |
| 1 |
|
4nn |
|- 4 e. NN |
| 2 |
1
|
nnne0i |
|- 4 =/= 0 |