"strong right porosity; sigma-porous set; Dini derivative"@en . . . "Zaj\u00ED\u010Dek, Lud\u011Bk" . . "2"^^ . "2"^^ . "We prove a result on the symmetry of Dini derivatives of arbitrary real functions of one real variable which is a joint generalization of Kantorovich's result from 1932 and of a result of L. Zaj\u00ED\u010Dek from 1981." . "CZ - \u010Cesk\u00E1 republika" . . . "RIV/00216208:11320/10:10050554!RIV11-GA0-11320___" . "51" . . . . "On Kantorovich's result on the symmetry of Dini derivatives" . "On Kantorovich's result on the symmetry of Dini derivatives"@en . "Commentationes Mathematicae Universitatis Carolinae" . "11320" . . . . . . . . "4" . "On Kantorovich's result on the symmetry of Dini derivatives"@en . "P(GA201/09/0067), Z(MSM0021620839)" . . "0010-2628" . . . "RIV/00216208:11320/10:10050554" . "11"^^ . "Koc, Martin" . "We prove a result on the symmetry of Dini derivatives of arbitrary real functions of one real variable which is a joint generalization of Kantorovich's result from 1932 and of a result of L. Zaj\u00ED\u010Dek from 1981."@en . "On Kantorovich's result on the symmetry of Dini derivatives" . "[F814005CB94E]" . "276737" .