On inscribed and described solids
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 4 (1997) no. 1, pp. 104-111 Cet article a éte moissonné depuis la source Math-Net.Ru

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The conditions needed for a solid in $\mathbf{R}^n$ to be placed in another solid are derived. The inequalities for the radius of a sphere which is inscribed into solid and the radius of a sphere which is discribed around solid in $\mathbf{R}^n$ are adduced.
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     author = {B. D. Kotlyar},
     title = {On inscribed and described solids},
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}
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B. D. Kotlyar. On inscribed and described solids. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 4 (1997) no. 1, pp. 104-111. http://geodesic.mathdoc.fr/item/JMAG_1997_4_1_a6/