Parabeln mit gemeinsamen isotropem Krümmungskreis.
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J. Tölke (1980)
Elemente der Mathematik
Stefan Węgrzynowski (1983)
Czechoslovak Mathematical Journal
Barbara Opozda, Udo Simon (2014)
Annales Polonici Mathematici
We investigate parallel hypersurfaces in the context of relative hypersurface geometry, in particular including the cases of Euclidean and Blaschke hypersurfaces. We describe the geometric relations between parallel hypersurfaces in terms of deformation operators, and we apply the results to the parallel deformation of special classes of hypersurfaces, e.g. quadrics and Weingarten hypersurfaces.
Wegner, Bernd (1997)
General Mathematics
Vanžurová, Alena (1995)
Archivum Mathematicum
Alena Vanžurová (1995)
Archivum Mathematicum
Our aim is to find conditions under which a 3-web on a smooth -dimensional manifold is locally equivalent with a web formed by three systems of parallel -planes in . We will present here a new approach to this “classical” problem using projectors onto the distributions of tangent subspaces to the leaves of foliations forming the web.
Andrzej Miernowski (2008)
Annales UMCS, Mathematica
Jean-Marc Richard observed in [7] that maximal perimeter of a parallelogram inscribed in a given ellipse can be realized by a parallelogram with one vertex at any prescribed point of ellipse. Alain Connes and Don Zagier gave in [4] probably the most elementary proof of this property of ellipse. Another proof can be found in [1]. In this note we prove that closed, convex curves having circles as π/2-isoptics have the similar property.
I.E. Valeontis (1986)
Manuscripta mathematica
Charles Thas (1978)
Czechoslovak Mathematical Journal
Klaus Deckelnick (1995)
Journal für die reine und angewandte Mathematik
Abdulaev, R. (1997)
Georgian Mathematical Journal
Harold R. Parks (1988)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
Mircea Crâşmăreanu (2001)
Mathematica Bohemica
First, by using the formulae of Krupka, the trace decomposition for some particular classes of tensors of types (1, 2) and (1, 3) is obtained. Second, it is proved that the traceless part of a tensor is an almost projective invariant of weight 1. We apply this result to Weyl curvature tensors.
Momčilo Bjelica (1997)
Matematički Vesnik
Bjelica, Momčilo (1997)
Matematichki Vesnik
Jovo P. Jarić, Dragoslav S. Kuzmanović (2013)
Zbornik Radova
Robert McIntosh (1987)
Journal für die reine und angewandte Mathematik
Dincă, Ion I. (2010)
SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Hélein, Frédéric (1998)
Documenta Mathematica
E. Combet (1985)
Publications du Département de mathématiques (Lyon)
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