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Keywords: Sphere-surgery1.png Surgery applied to a two-sphere removing a cylinder and inserting two disks en wikipedia dfeldmann 2007-05-28 Vivacissamamente wikipedia en diagram en wikipedia Vivacissamamente Original upload log page en wikipedia Sphere-surgery1 png 2007-05-28 06 22 Vivacissamamente 381×375× 11576 bytes <nowiki>Surgery applied to a two-sphere removing a cylinder and inserting two disks </nowiki> Cobordism Geometric topology Number theory |