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Duocylinder
The duocylinder, or double cylinder, is a geometric object embedded in 4-dimensional Euclidean space, defined as the Cartesian product of two disks of radii ''r''1 and ''r''2: : It is analogous to a cylinder in 3-space, which is the Cartesian product of a disk with a line segment. But unlike the cylinder, both hypersufaces (of a regular duocylinder) are congruent. ==Geometry==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Duocylinder」の詳細全文を読む
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