Description: If an integer is greater than 3, then it is a positive integer. (Contributed by Alexander van der Vekens, 17-Sep-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | eluzge3nn | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1z | |
|
2 | 1le3 | |
|
3 | eluzuzle | |
|
4 | 1 2 3 | mp2an | |
5 | elnnuz | |
|
6 | 4 5 | sylibr | |