Description: A half-open integer interval is a subset of an upper set of integers. (Contributed by Glauco Siliprandi, 8-Apr-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | fzossuz | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fzossfz | |
|
2 | fzssuz | |
|
3 | 1 2 | sstri | |