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Displaying 161 – 180 of 535

Some decay properties for the damped wave equation on the torus

Nalini Anantharaman, Matthieu Léautaud (2012)

Journées Équations aux dérivées partielles

This article is a proceedings version of the ongoing work [1], and has been the object of a talk of the second author during the Journées “Équations aux Dérivées Partielles” (Biarritz, 2012).We address the decay rates of the energy of the damped wave equation when the damping coefficient $b$ does not satisfy the Geometric Control Condition (GCC). First, we give a link with the controllability of the associated Schrödinger equation. We prove that the observability of the Schrödinger group implies that...

Some decomposition lemmas of diffeomorphisms

Vicente Cervera, Francisca Mascaro (1992)

Compositio Mathematica

Some differential operators connected with quasiconformal deformations on manifold

A. Pierzchalski (1987)

Banach Center Publications

Some Elementary Superdifferentiable Functions

A. G. Fellouris (1997)

Δελτίο της Ελληνικής Μαθηματικής Εταιρίας

Some estimates of integrals with a composition operator.

Liu, Bing (2010)

Journal of Inequalities and Applications [electronic only]

Some examples of harmonic maps for $g$ -natural metrics

Mohamed Tahar Kadaoui Abbassi, Giovanni Calvaruso, Domenico Perrone (2009)

Annales mathématiques Blaise Pascal

We produce new examples of harmonic maps, having as source manifold a space $(M, g)$ of constant curvature and as target manifold its tangent bundle $T M$ , equipped with a suitable Riemannian $g$ -natural metric. In particular, we determine a family of Riemannian $g$ -natural metrics $G$ on $T 𝕊^{2}$ , with respect to which all conformal gradient vector fields define harmonic maps from $𝕊^{2}$ into $(T 𝕊^{2}, G)$ .

Some existence results for the scalar curvature problem via Morse theory

Andrea Malchiodi (1999)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

We prove existence of positive solutions for the equation $- △_{g_{0}} u + u = (1 + ϵ K (x)) u^{2^{*} - 1}$ on $S^{n}$ , arising in the prescribed scalar curvature problem. is the Laplace-Beltrami operator on $S^{n}$ , $2^{*}$ is the critical Sobolev exponent, and $ϵ$ is a small parameter. The problem can be reduced to a finite dimensional study which is performed with Morse theory.

Some fixed point theorems in metric and Banach spaces

Josef Daneš (1971)

Commentationes Mathematicae Universitatis Carolinae

Some functorial prolongations of general connections

Ivan Kolář (2018)

Archivum Mathematicum

We consider the problem of prolongating general connections on arbitrary fibered manifolds with respect to a product preserving bundle functor. Our main tools are the theory of Weil algebras and the Frölicher-Nijenhuis bracket.

Some functorial properties of microlocalization for 𝓓-modules

Teresa Fernandes (1996)

Banach Center Publications

Some further results on lifts of linear vector fields related to product preserving gauge bundle functors on vector bundles

A. Ntyam, G. F. Wankap Nono, Bitjong Ndombol (2016)

Archivum Mathematicum

We present some lifts (associated to a product preserving gauge bundle functor on vector bundles) of sections of the dual bundle of a vector bundle, some derivations and linear connections on vector bundles.

Some generic properties of nonlinear second order diffusional type problem

Vladimír Ďurikovič, Mária Ďurikovičová (1999)

Archivum Mathematicum

We are interested of the Newton type mixed problem for the general second order semilinear evolution equation. Applying Nikolskij’s decomposition theorem and general Fredholm operator theory results, the present paper yields sufficient conditions for generic properties, surjectivity and bifurcation sets of the given problem.

Some geometric aspects of the calculus of variations in several independent variables

David Saunders (2010)

Communications in Mathematics

This paper describes some recent research on parametric problems in the calculus of variations. It explains the relationship between these problems and the type of problem more usual in physics, where there is a given space of independent variables, and it gives an interpretation of the first variation formula in this context in terms of cohomology.

Some Gradient Estimates on Covering Manifolds

Nick Dungey (2004)

Bulletin of the Polish Academy of Sciences. Mathematics

Let M be a complete Riemannian manifold which is a Galois covering, that is, M is periodic under the action of a discrete group G of isometries. Assuming that G has polynomial volume growth, we provide a new proof of Gaussian upper bounds for the gradient of the heat kernel of the Laplace operator on M. Our method also yields a control on the gradient in case G does not have polynomial growth.

Some heat operators on $ℙ (ℝ^{d})$

H. Airault, P. Malliavin (1996)

Annales mathématiques Blaise Pascal

Some higher order operations with connections

Ivan Kolář (1974)

Czechoslovak Mathematical Journal

Some higher order operations with connections (Preliminary communication)

Ivan Kolář (1973)

Commentationes Mathematicae Universitatis Carolinae

Some invariants of Lie algebroids of principal fibre bundles

Kubarski, Jan (1989)

Proceedings of the Winter School "Geometry and Physics"

Some liftings of Poisson structures to Weil bundles

Jacek Dębecki (2006)

Czechoslovak Mathematical Journal

We establish a formula for the Schouten-Nijenhuis bracket of linear liftings of skew-symmetric tensor fields to any Weil bundle. As a result we obtain a construction of some liftings of Poisson structures to Weil bundles.

Some Natural Constructions on Vector Fields and Higher Order Cotangent Bundles.

W.M. Mikulski (1994)

Monatshefte für Mathematik

Currently displaying 161 – 180 of 535

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