Description: Reverse closure for half-open integer sets. (Contributed by Stefan O'Rear, 14-Aug-2015)
Ref | Expression | ||
---|---|---|---|
Assertion | elfzoelz | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elfzoel1 | |
|
2 | elfzoel2 | |
|
3 | fzof | |
|
4 | 3 | fovcl | |
5 | 1 2 4 | syl2anc | |
6 | 5 | elpwid | |
7 | id | |
|
8 | 6 7 | sseldd | |