A solid of constant width is an analog of a curve of constant width to three dimensions. Specifically, it is a convex shape having the property that any two parallel tangent or supporting planes which contain the shape between them are at a fixed distance apart (Bogosel 2023).
Solids of constant width include the Meissner tetrahedra and more generally the Meissner polyhedra.
See also
Curve of Constant Width, Meissner Polyhedron, Meissner Tetrahedra
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References
Bayen, T.; Lachand-Robert, T.; and Oudet, É. "Analytic Parametrization of Three-Dimensional Bodies of Constant Width." Arch. Ration. Mech. Anal. 186, 225-249, 2007.Bogosel, B. "Volume Computation for Meissner Polyhedra and Applications." 25 Oct 2023. https://arxiv.org/abs/2310.17672.Croft, H. T.; Falconer, K. J.; and Guy, R. K. "Minimal Bodies of Constant Width." §A22 in Unsolved Problems in Geometry. New York: Springer-Verlag, p. 34, 1991.Lachand-Robert, T. and Oudet, É. "Bodies of Constant Width in Arbitrary Dimension." Math. Nachr. 280, 740-750, 2007.
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Cite this as:
Weisstein, Eric W. "Solid of Constant Width." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/SolidofConstantWidth.html