Steffen's Flexible Polyhedron

Steffen's polyhedron is able to flex without self-intersection and without distorting any of its faces. It has 14 triangular faces, 21 edges, and 9 vertices. Euler had conjectured no polyhedron could flex. Cauchy proved that convex polyhedra cannot flex.

Contributed by: Mark McClure

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Flexible Polyhedron (Wolfram MathWorld)

"Steffen's Flexible Polyhedron" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/SteffensFlexiblePolyhedron/

Contributed by: Mark McClure

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