Double groupoids and crossed modules
Double linear connections
Double points on characteristics
Double Points on Characteristics. A fixed surface of a moving space will envelope a surface of the fixed space , if we move with respect to . In the general case at each moment of the one-parameter motion there exists a curve on , along which the position of and the enveloped surface are in contact. In the paper we study the interesting special case, where has some double point . This depends on relations between differential geometric properties in the neighbourhood of of the...
Double quotients of Lie groups with integrable geodesic flow.
Double vector bundles and duality
The notions of the dual double vector bundle and the dual double vector bundle morphism are defined. Theorems on canonical isomorphisms are formulated and proved. Several examples are given.
Doubling constant mean curvature tori in S
The Clifford tori in constitute a one-parameter family of flat, two-dimensional, constant mean curvature (CMC) submanifolds. This paper demonstrates that new, topologically non-trivial CMC surfaces resembling a pair of neighbouring Clifford tori connected at a sub-lattice consisting of at least two points by small catenoidal bridges can be constructed by perturbative PDE methods. That is, one can create a submanifold that has almost everywhere constant mean curvature by gluing a re-scaled catenoid...
Doubly projected tensor fields and connections in a second order semitangent bundle
Doubly warped product -submanifolds in a locally conformal Kähler space form.
Doubly warped product Finsler manifolds with some non-Riemannian curvature properties
We consider doubly warped product (DWP) Finsler manifolds with some non-Riemannian curvature properties. First, we study Berwald and isotropic mean Berwald DWP-Finsler manifolds. Then we prove that every proper Douglas DWP-Finsler manifold is Riemannian. We show that a proper DWP-manifold is Landsbergian if and only if it is Berwaldian. Then we prove that every relatively isotropic Landsberg DWP-manifold is a Landsberg manifold. We show that a relatively isotropic mean Landsberg warped product manifold...
Doubly warped product submanifolds of (κ,μ)-contact metric manifolds
We establish sharp inequalities for C-totally real doubly warped product submanifolds in (κ,μ)-contact space forms and in non-Sasakian (κ,μ)-contact metric manifolds.
Doubly warped products with harmonic Weyl conformal curvature tensor
Dr Dragomir Lopandić (1929-1981)
Drawing instruments: Theories and practices from history to didactics.
Dreidimensionale Lie Gruppen und ebene Kinematik. (Three-dimensional Lie groups and plane kinematics).
Du côté de chez Pu
Dual Connections and Affine Geometry.
Dual connections in Finsler geometry.
Dualité symplectique, feuillitages et géometrie du moment.
One gives the links between the notions of singular foliations, Γ-structures and momentum mapping in the context of symplectic geometry.
Duality and integrability on contact Fano manifolds.
Duality and minimality in Riemannian foliations.