Geodesic
Convex solids with hyperplanar midsurfaces for restricted families of chords
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 2 (2011), pp. 23-40.

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We provide new characteristic properties of convex quadrics in Rn in terms of hyperplanarity of midsurfaces of convex solids for restricted families of chords. These properties are based on various auxiliary characterizations of convex quadrics that involve hyperplane supports and plane quadric sections. 
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Valeriu Soltan. Convex solids with hyperplanar midsurfaces for restricted families of chords. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 2 (2011), pp. 23-40. https://geodesic-test.mathdoc.fr/item/BASM_2011_2_a2/

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