Une propriété des surfaces rationnelles
Une résolution en singularités toriques simpliciales des singularités-quotient de dimension trois
Unfoldings in Knot Theory.
Unfoldings Knot Theory (Corrigendum).
Unibranch orbit closures in module varieties
Uniqueness of crepant resolutions and symplectic singularities
We prove the uniqueness of crepant resolutions for some quotient singularities and for some nilpotent orbits. The finiteness of non-isomorphic symplectic resolutions for 4- dimensional symplectic singularities is proved. We also give an example of a symplectic singularity which admits two non-equivalent symplectic resolutions.
Universell-endliche Erweiterungen analytischer Algebren.
Unramified Brauer group of the moduli spaces of PGLr(ℂ)-bundles over curves
Let X be an irreducible smooth complex projective curve of genus g, with g ≥ 2. Let N be a connected component of the moduli space of semistable principal PGLr (ℂ)-bundles over X; it is a normal unirational complex projective variety. We prove that the Brauer group of a desingularization of N is trivial.
Unramified cohomology of alternating groups
We prove vanishing results for the unramified stable cohomology of alternating groups.
Unramified nonspecial real space curves having many real branches and few ovals.
Let C ⊆ Pn be an unramified nonspecial real space curve having many real branches and few ovals. We show that C is a rational normal curve if n is even, and that C is an M-curve having no ovals if n is odd.