Geodesic
A necessary flexibility condition for a nondegenerate suspension in Lobachevsky 3-space
Sbornik. Mathematics, Tome 204 (2013) no. 8, pp. 1195-1214 Cet article a éte moissonné depuis la source Math-Net.Ru

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We show that some combination of the lengths of all edges of the equator of a flexible suspension in Lobachevsky 3-space is equal to zero (each length is taken with a ‘plus’ or ‘minus’ sign in this combination). Bibliography: 10 titles.
Keywords: flexible polyhedron, hyperbolic space, Connelly method, equator of a suspension.
Mots-clés : flexible suspension 
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D. A. Slutskii. A necessary flexibility condition for a nondegenerate suspension in Lobachevsky 3-space. Sbornik. Mathematics, Tome 204 (2013) no. 8, pp. 1195-1214. http://geodesic.mathdoc.fr/item/SM_2013_204_8_a5/

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