%0 Journal Article %A S. V. Shvedenko %T Natural logarithm as a starting point for defining elementary functions %J Matematičeskoe obrazovanie %D 2020 %P 55-60 %N 4 %U http://geodesic.mathdoc.fr/item/MO_2020_4_a7/ %G ru %F MO_2020_4_a7