Článek obsahuje řadu poznámek o množinách nediferencovatelnosti lipschitzovských a konvexních funkcí. Je dokázáno, že množina bodů nediferencovatelnosti konvexní funkce na eukleidovském prostoru je sigma-silně pórovitá. (cs)
Several notes on sets of non-differentiability of Lipschitz and convex functions are presented. It is proved that the set of non-differentiability points of a convex function in a Euclidean space is sigma-strongly porous.
Several notes on sets of non-differentiability of Lipschitz and convex functions are presented. It is proved that the set of non-differentiability points of a convex function in a Euclidean space is sigma-strongly porous. (en)