Description: The real numbers are simply connected. (Contributed by Mario Carneiro, 9-Mar-2015)
Ref | Expression | ||
---|---|---|---|
Assertion | retopsconn | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | retop | |
|
2 | ioomax | |
|
3 | uniretop | |
|
4 | 2 3 | eqtri | |
5 | 4 | restid | |
6 | 1 5 | ax-mp | |
7 | ioosconn | |
|
8 | 6 7 | eqeltrri | |