Description: A half-open integer interval is nonempty iff it contains its left endpoint. (Contributed by Mario Carneiro, 29-Sep-2015)
Ref | Expression | ||
---|---|---|---|
Assertion | fzon0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | n0 | ||
2 | elfzolt3b | ||
3 | 2 | exlimiv | |
4 | 1 3 | sylbi | |
5 | ne0i | ||
6 | 4 5 | impbii |