Unitary spectum and the fundamental group for actions of semisimple Lie groups.
Univalency of harmonic mappings between surfaces.
Univalent mappings of the plane into itself
Universal bounds for eigenvalues of Schrödinger operators on Riemannian manifolds.
Universal Connections.
Universal connections on Lie groupoids.
Universal isomonodromic deformations of meromorphic rank 2 connections on curves
We consider tracefree meromorphic rank 2 connections over compact Riemann surfaces of arbitrary genus. By deforming the curve, the position of the poles and the connection, we construct the global universal isomonodromic deformation of such a connection. Our construction, which is specific to the tracefree rank 2 case, does not need any Stokes analysis for irregular singularities. It is thereby more elementary than the construction in arbitrary rank due to B. Malgrange and I. Krichever and it includes...
Universal lifting theorem and quasi-Poisson groupoids
We prove the universal lifting theorem: for an -simply connected and -connected Lie groupoid with Lie algebroid , the graded Lie algebra of multi-differentials on is isomorphic to that of multiplicative multi-vector fields on . As a consequence, we obtain the integration theorem for a quasi-Lie bialgebroid, which generalizes various integration theorems in the literature in special cases. The second goal of the paper is the study of basic properties of quasi-Poisson groupoids. In particular,...
Universal manifold pairings and positivity.
Universal natural shapes
Universal prolongation of linear partial differential equations on filtered manifolds
The aim of this article is to show that systems of linear partial differential equations on filtered manifolds, which are of weighted finite type, can be canonically rewritten as first order systems of a certain type. This leads immediately to obstructions to the existence of solutions. Moreover, we will deduce that the solution space of such equations is always finite dimensional.
Universal spaces for manifolds equipped with an integral closed -form
In this note we prove that any integral closed -form , , on a m-dimensional manifold , , is the restriction of a universal closed -form on a universal manifold as a result of an embedding of to .
Univerzální přírodní tvary
Unstable minimal surfaces and Heegaard splittings.
Unstable Solutions of the Euler Equations of Certain Variational Problems.
Untermannigfaltigkeiten reduktiver Räume
Untermannigfaltigkeiten von homogenen Räumen
Untermannigfaltigkieten mit paralleler zweiter Fundamentalform in euklidischen Räumen und Sphären.
Untersuchung über den Zusammenhang der Flächen im Sinne Riemann's
Untersuchungen über einige Puncte aus der allgemeinen Theorie der Flächen