Duocylinder
4-dimensional object / From Wikipedia, the free encyclopedia
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See also: Polydisc
The duocylinder, also called the double cylinder or the bidisc, is a geometric object embedded in 4-dimensional Euclidean space, defined as the Cartesian product of two disks of respective radii r1 and r2:
It is similar to a cylinder in 3-space, which is the Cartesian product of a disk with a line segment. But unlike the cylinder, both hypersurfaces (of a regular duocylinder) are congruent.
Its dual is a duospindle, constructed from two circles, one in the xy-plane and the other in the zw-plane.