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Über den Umriss der konvexen Flächen

Václav Medek (1978)

Aplikace matematiky

In dem Artikel is eine Methode zur Konstruktion des Umrisses eines konvexen Gebildes beschrieben, die für automatische Bearbeitung geeignet ist.

Une famille d’inégalités pour les ensembles convexes du plan

Michel Crouzeix (2005)

Annales mathématiques Blaise Pascal

Nous considérons une famille de fonctions ne dépendant que de la forme d’un ensemble convexe du plan. Nous en donnons des majorations faisant intervenir le plus petit rapport des rayons des couronnes qui contiennent la frontière de ce convexe.

Upper estimates on self-perimeters of unit circles for gauges

Horst Martini, Anatoliy Shcherba (2016)

Colloquium Mathematicae

Let M² denote a Minkowski plane, i.e., an affine plane whose metric is a gauge induced by a compact convex figure B which, as a unit circle of M², is not necessarily centered at the origin. Hence the self-perimeter of B has two values depending on the orientation of measuring it. We prove that this self-perimeter of B is bounded from above by the four-fold self-diameter of B. In addition, we derive a related non-trivial result on Minkowski planes whose unit circles are quadrangles.

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