Geodesic
On inequalities in a tetrahedron, finished
Matematičeskoe obrazovanie, Tome 99 (2021) no. 3, pp. 58-69

Voir la notice de l'article provenant de la source Math-Net.Ru

The exact boundaries of variation of the surface area, volume, and other quantities of tetrahedrons are found for a given ratio of the radii of the inscribed and circumscribed spheres. The relationship between the method of conditional extremum and envelopes is considered on rather bright and meaningful examples. Finished. 
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     author = {V. N. Novikov},
     title = {On inequalities in a tetrahedron, finished},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {58--69},
     publisher = {mathdoc},
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     number = {3},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2021_99_3_a6/}
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V. N. Novikov. On inequalities in a tetrahedron, finished. Matematičeskoe obrazovanie, Tome 99 (2021) no. 3, pp. 58-69. http://geodesic.mathdoc.fr/item/MO_2021_99_3_a6/