The Alexander Sphere
A path that is homoemorphic to a circle devides a compactified plane into two pieces (inside and outside). Arthur Schönflies proved in 1906 that in...
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![1 Hour of Chad Orthodox Chants to Redeem Your Soul [РУССКАЯ ВЕРСИЯ]](https://sun9-34.userapi.com/wzQ9QWvYuIea66IaQez-3atnY1HpUwACmBSFUA/S9v0sPOu8bY.jpg)
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