%0 Journal Article %A Karl Menger %T Rates of change and derivatives %J Fundamenta Mathematicae %D 1958 %P 89-102 %V 46 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-46-1-89-102/ %R 10.4064/fm-46-1-89-102 %G en %F 10_4064_fm_46_1_89_102