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>> No.12212790 [View]
File: 161 KB, 1190x607, 2020-10-09-233834_1190x607_scrot.png [View same] [iqdb] [saucenao] [google]
12212790

Help boys, highlighted line is problematic.
If you have different proof that there is no retraction from closed disk to circle without fundamental groups, I would appreciate it.

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