Geodesic
Numeric measure of a triangle sides' diversification
Matematičeskoe obrazovanie, Tome 83 (2017) no. 3, pp. 51-53.

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A numeric measure of a triangle sides' diversification is suggested.
Keywords: an isosceles triangle, a versatile triangle, a numerical measure of heterogeneity. 
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A. V. Yastrebov. Numeric measure of a triangle sides' diversification. Matematičeskoe obrazovanie, Tome 83 (2017) no. 3, pp. 51-53. http://geodesic.mathdoc.fr/item/MO_2017_83_3_a6/

[1] Yastrebov A.V., “Shkolnyi uchebnik kak istochnik issledovatelskikh zadach”, Uchebnyi god, 2007, no. 1, 72–77

[2] Yastrebov A.V., “Neravenstva Ki Fana v issledovaniyakh shkolnikov”, Teoreticheskie i prikladnye aspekty matematiki, informatiki i obrazovaniya, Mezhdunar. nauch. konf. (Arkhangelsk 16–21 noyabrya 2014 g.), SAFU, Arkhangelsk, 2014, 126–131