Description: The unit interval is simply connected. (Contributed by Mario Carneiro, 9-Mar-2015)
Ref | Expression | ||
---|---|---|---|
Assertion | iisconn | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfii2 | |
|
2 | 0re | |
|
3 | 1re | |
|
4 | iccsconn | |
|
5 | 2 3 4 | mp2an | |
6 | 1 5 | eqeltri | |