# rigidity

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**Abnormal posturing**— Classification and external resources ICD 10 R29.3 ICD 9 781.92 Abnormal posturing is an in …82

**Cauchy's theorem (geometry)**— Cauchy s theorem is a theorem in geometry, named after Augustin Cauchy. It states that convex polytopes with congruent corresponding faces are congruent. This is a foundational result in rigidity theory. tatementLet P, Q subset Bbb R^3 be… …83

**Коннелли, Роберт**— Роберт Коннелли (англ. Robert Connelly) (род. 15 июля 1942(19420715), Сеуикли, Пенсильвания, США)  американский математик, специалист по комбинаторной геометрии и теории структурной жёсткости (англ. Structural rigidity).… …84

**industrial polymers, major**— Introduction chemical compounds used in the manufacture of synthetic industrial materials. In the commercial production of plastics, elastomers, man made fibres, adhesives, and surface coatings, a tremendous variety of polymers are… …85

**rigidness**— noun 1. the physical property of being stiff and resisting bending • Syn: ↑rigidity • Derivationally related forms: ↑rigid, ↑rigid (for: ↑rigidity), ↑rigidify (for: ↑ …86

**Mazda RX-8**— Manufacturer Mazda Production 2003–2011[1] Assembly …87

**Ehrenfest paradox**— The Ehrenfest paradox concerns the rotation of a rigid disc in the theory of relativity.In its original formulation as presented by Paul Ehrenfest 1909 in the Physikalische Zeitschrift, it discusses an ideally rigid cylinder that is made to… …88

**Aluminium alloy**— Aluminium alloys are alloys of aluminium, often with copper, zinc, manganese, silicon, or magnesium. They are much lighter and more corrosion resistant than plain carbon steel, but not quite as corrosion resistant as pure aluminium. Bare… …89

**Flexible polyhedron**— In geometry, a flexible polyhedron is a polyhedral surface that allows continuous non rigid deformations such that all faces remain rigid. The Cauchy rigidity theorem shows that in dimension 3 such a polyhedron cannot be convex (this is also …90

**Saint-Venant's theorem**— In solid mechanics, it is common to analyze the properties of beams with constant cross section. Saint Venant s theorem states that the simply connected cross section with maximal torsional rigidity is a circle. E. Makai, A proof of Saint Venant… …