manuscripta mathematica
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A note on the kernel of the $$\bar \partial $$ -Neumann operator on strongly pseudo-convex domains
manuscripta mathematica - Tập 62 Số 4 - Trang 437-447 - 1988
Common multiples of operator polynomials with analytic coefficients
manuscripta mathematica - Tập 25 - Trang 279-314 - 1978
This paper describes the main properties of analytic common monic left multiples of a system of monic operator polynomials whose coefficients depend analytically on ε.
Deux remarques sur les flots riemanniens
manuscripta mathematica - Tập 51 - Trang 145-161 - 1985
Let M be a connected oriented closed n-manifold. A riemannian flow
$$\mathfrak{F}$$
on M is an oriented one dimensional foliation which admits a bundle-like metric. We give a caracterization of isometric flows as riemannian flows whose basic cohomology H
b
n−1
......
A generalization of Steiner symmetrization for immersed surfaces and its applications
manuscripta mathematica - Tập 87 - Trang 311-325
We generalize the classical Steiner symmetrization to surfaces with self-intersections. Then we apply the generalized Steiner symmetrization to several isoperimetric problems. For example, let Г⊂ℝ3 be an analytic plane Jordan curve which is symmetric with respect to a plane ϖ (ϖ⊅Г). LetS be a compact immersed surface bounded by Λ which has the smallest area among all compact surfaces bounded by Λ ......
Finsler structures of negative curvature in ⊄-linear fibre spaces
manuscripta mathematica - Tập 34 - Trang 121-133 - 1981
Let X be a reduced compact complex space and E→X a ⊄-linear fibre space. Let P(E) be the associated projective variety over X and let L(E) be the canonical line bundle over P(E). Generalizing a result of Kobayashi, we prove that E carries a Finsler metric of negative curvature if and only if L(E)red→P(E)red carries an Hermitian metric of negative curvature.
Stein quotients of connected complex lie groups
manuscripta mathematica - Tập 50 - Trang 185-214 - 1985
Various algebraic and geometric conditions on connected complex Lie groups G and H are shown to characterize the quotient G/H as a Stein manifold. Among these conditions are analytic analogues of the algebraic notions of observable or strongly observable subgroups and cohomological conditions expressed in terms of equivariant maps. A specific group theoretic condition on H, generalizing Matsushima......
A generalization of Eisenstein–Schönemann irreducibility criterion
manuscripta mathematica - Tập 134 Số 1-2 - Trang 215-224 - 2011
Some remarks on the study of good contractions
manuscripta mathematica - Tập 87 Số 1 - Trang 359-367 - 1995
LetX be a complex projective variety with log terminal singularities admitting an extremal contraction in terms of Minimal Model Theory, i.e. a projective morphism φ:X→Z onto a normal varietyZ with connected fibers which is given by a (high multiple of a) divisor of the typeK x+rL, wherer is a positive rational number andL is an ample Cartier divisor. We first prove that the dimension of anu fiber......
On the sublinear functional associated to a family of invariant means
manuscripta mathematica - Tập 55 - Trang 101-109 - 1986
In this paper we give conditions under which we can obtain explicit analytic expressions of the fundamental sublinear functional PK of the family of means K=[G]∩J where [G] is a subset of G-invariant means, G a semigroup of operators on 1∞ and J a saturated set of means. Such conditions allow us to assure that [G]∩J≠φ. We characterize the set of the almost convergent sequences related to the famil......
Isometric embeddings of spherical spaceforms with cyclic fundamental groups
manuscripta mathematica - Tập 64 - Trang 127-133 - 1989
We construct a sequence of isometric embeddings of spherical spaceforms with cylcic fundamental groups. The standard sphere and Veronese embedding are the first two elements in this sequence. The embeddings are orbits under the unitary group and consequently the lengths of geometric quantities (like the 2nd fundamental form or the mean curvature vector) are constant.
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