Saddle surfaces admitting local support planes.
Schallfronten an ebenen Kurven. I.
Several new characterizations of the 2-dimensional sphere in
Sich schliessende p-Ecke aus Evoluten.
Sobre la dualidad entre el teorema de Gauss-Bonnet y la integral de geodésicas que cortan a una curva sobre una superficie.
Solution de la question d'analyse proposée au concours d'agrégation de 1875
Solution de la question de mathématiques spéciales, proposée au concours d'admission à l'École polytechnique (1875)
Solutions of some visibility and contour problems in the visualisation of surfaces.
Some global characterizations of the sphere in
Some Global Theorems on Non-Complete Surfaces
Some remarks on duality in
In this paper we review some of the concepts and results of V. I. Arnol’d [1] for curves in and extend them to curves and surfaces in .
Some remarks on surfaces in the 4-dimensional Euclidean space
Spacelike intersection curve of three spacelike hypersurfaces in E41
In this paper, we compute the Frenet vectors and the curvatures of the spacelike intersection curve of three spacelike hypersurfaces given by their parametric equations in four-dimensional Minkowski space E41.
Special curves and ruled surfaces.
Spektrale Starrheit gewisser Drehflächen.
Spezielle ebene Kurven als Leitlinien isophotischer Zylinderstreifen
Striktionseigenschaften von Regelscharen im En.
Structurally stable configurations of lines of mean curvature and umbilic points on surfaces immersed in R3.
In this paper we study the pairs of orthogonal foliations on oriented surfaces immersed in R3 whose singularities and leaves are, respectively, the umbilic points and the lines of normal mean curvature of the immersion. Along these lines the immersions bend in R3 according to their normal mean curvature. By analogy with the closely related Principal Curvature Configurations studied in [S-G], [GS2], whose lines produce the extremal normal curvature for the immersion, the pair of foliations by lines...
Submanifold Dirac operators with torsion.
Sufficient conditions for the extendibility of an -th order flex of polyhedra.