Description: A closed interval is simply connected. (Contributed by Mario Carneiro, 9-Mar-2015)
Ref | Expression | ||
---|---|---|---|
Assertion | iccsconn | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | iccconn | |
|
2 | iccssre | |
|
3 | eqid | |
|
4 | 3 | resconn | |
5 | 2 4 | syl | |
6 | 1 5 | mpbird | |