%0 Journal Article %A Stanisław Gołąb %A M. Kucharzewski %T On the notion of gradient. II. A certain extremal property of direction of the gradient vector %J Annales Polonici Mathematici %D 1960 %P 5-12 %V 8 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-8-1-5-12/ %R 10.4064/ap-8-1-5-12 %G en %F 10_4064_ap_8_1_5_12