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Heesch's problem. Ammann's example of a polygon with Heesch number 3 剪贴画
17天
Triangle used by the Egyptians to check for the existence of a right angle. Also known as the Egyptian triangle 剪贴画
Correct 3D construction of a rhombohedron solid stump 剪贴画
Iconic image to idealize a distance 剪贴画
Points on a line and a plane 剪贴画
Image to illustrate a random plane in conic perspective 剪贴画
15天
Structure of the characteristic gömböc by Domokos and Várkonyi 剪贴画
16天
飞吻 剪贴画
差不多4年
The same diagram but with a slight change in angle and many new annotations 剪贴画
Pythagorean triangle with sides a b and c 剪贴画
Wikipedia 20 - AT Wien Klimt-Kuss 剪贴画
超过2年