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MOVING POLYHEDRA |
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All
convex polyhedra are rigid, but there are non-convex polyhedra that are
flexible, formed either by bars and edges or by faces, edges and
vertices that can “move”. Formally, the polyhedron P is flexible if
there exists a family Pt (t³0) of polyhedra with P0=P and for each
instant t¹0, Pt is isometric to P, but is not
obtained from P from direct spatial isometry. |
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Which polygons are flexible in space? | |
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Solution | |
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