EuDML | Browse

Items

All a b c d e f g h i j k l m n o p q r s t u v w x y z Other

Previous Page 81 Next

Displaying 1601 – 1620 of 1688

Surfaces à courbure moyenne constante et inégalité de Wente

Frédéric Hélein (1996/1997)

Séminaire de théorie spectrale et géométrie

Surfaces of Constant Curvature and Geometric Interpretations of the Klein-gordon, Sine-gordon and Sinh-gordon Equations

Boris A. Rosenfeld, Nadezhda E. Maryukova (1997)

Publications de l'Institut Mathématique

Surge motion on a floating cylinder in water of finite depth.

Bhatta, Dambaru D. (2003)

International Journal of Mathematics and Mathematical Sciences

Surjectivity of partial differential operators on ultradistributions of Beurling type in two dimensions

Thomas Kalmes (2010)

Studia Mathematica

We show that if Ω is an open subset of ℝ², then the surjectivity of a partial differential operator P(D) on the space of ultradistributions $_{(ω)}^{'} (Ω)$ of Beurling type is equivalent to the surjectivity of P(D) on $C^{\infty} (Ω)$ .

Switching control

Enrique Zuazua (2011)

Journal of the European Mathematical Society

We analyze the problem of switching controls for control systems endowed with different actuators. The goal is to control the dynamics of the system by switching from an actuator to the other in a systematic way so that, in each instant of time, only one actuator is active. We first address a finite-dimensional model and show that, under suitable rank conditions, switching control strategies exist and can be built in a systematic way. To do this we introduce a new variational principle building...

Symbol calculus on the affine group "ax + b"

Qihong Fan (1995)

Studia Mathematica

The symbol calculus on the upper half plane is studied from the viewpoint of the Kirillov theory of orbits. The main result is the $L^{p}$ -estimates for Fuchs type pseudodifferential operators.

Symetrie: Ano či ne?

Bernhard Kawohl (2003)

Pokroky matematiky, fyziky a astronomie

Symétrisabilité des matrices localisées d'une matrice fortement hyperbolique en un point multiple

Jean Vaillant (1978)

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze

Symétrisations indépendantes du temps pour certains opérateurs du type de Schrödinger. I

Jiro Takeuchi (2002)

Bollettino dell'Unione Matematica Italiana

Si danno condizioni sufficienti e condizioni necessarie affinché il problema di Cauchy per alcuni operatori di tipo Schrödinger sia ben posto in spazi di Sobolev. Gli operatori qui considerati sono operatori di Schrödinger con potenziali vettoriali complessi, una generalizzazione degli operatori di 2-evoluzione nel senso di Petrowsky, e alcuni sistemi tipo Leray-Volevich di operatori lineari a derivate parziali. Il metodo che usiamo in questo articolo è la simmetrizazione $L^{2}$ degli operatori non dipendenti...

Symmetric hyperbolic systems with boundary conditions that do not satisfy the Kreiss-Sakamoto condition

Matthias Eller (2008)

Applicationes Mathematicae

Symmetric hyperbolic systems with a class of non-homogeneous boundary conditions that do not satisfy the Kreiss-Sakamoto condition (or uniform Lopatinskii condition) are discussed. The boundary conditions are of conservative type. An energy estimate which provides interior and boundary regularity for weak solutions to the system is proved. The results are valid for operators with rough coefficients. As an example the anisotropic Maxwell system is considered.

Symmetric solutions to minimization of a $p$ -energy functional with ellipsoid value.

Lei, Yutian (2003)

Electronic Journal of Qualitative Theory of Differential Equations [electronic only]

Symmetries of connections on fibered manifolds

Alexandr Vondra (1994)

Archivum Mathematicum

The (infinitesimal) symmetries of first and second-order partial differential equations represented by connections on fibered manifolds are studied within the framework of certain “strong horizontal“ structures closely related to the equations in question. The classification and global description of the symmetries is presented by means of some natural compatible structures, eġḃy vertical prolongations of connections.

Symmetries of Conservation Laws

Sanja Konjik (2005)

Publications de l'Institut Mathématique

Symmetries of factor systems.

Bagderina, Yu.Yu. (2005)

Sibirskij Matematicheskij Zhurnal

Symmetries of the nonlinear Schrödinger equation

Benoît Grébert, Thomas Kappeler (2002)

Bulletin de la Société Mathématique de France

Symmetries of the defocusing nonlinear Schrödinger equation are expressed in action-angle coordinates and characterized in terms of the periodic and Dirichlet spectrum of the associated Zakharov-Shabat system. Application: proof of the conjecture that the periodic spectrum $\dots < λ_{k}^{-} \leq λ_{k}^{+} < λ_{k + 1}^{-} \leq \dots$ of a Zakharov-Shabat operator is symmetric,i.e. $λ_{k}^{\pm} = - λ_{- k}^{\mp}$ for all $k$ , if and only if the sequence ${(γ_{k})}_{k \in ℤ}$ of gap lengths, $γ_{k} : = λ_{k}^{+} - λ_{k}^{-}$ , is symmetric with respect to $k = 0$ .

Symmetrization in nonlinear parabolic equations

Vázquez, Juan L. (1982)

Portugaliae mathematica

Symmetrization of functions and principal eigenvalues of elliptic operators

François Hamel, Nikolai Nadirashvili, Emmanuel Russ (2011/2012)

Séminaire Laurent Schwartz — EDP et applications

In this paper, we consider shape optimization problems for the principal eigenvalues of second order uniformly elliptic operators in bounded domains of $ℝ^{n}$ . We first recall the classical Rayleigh-Faber-Krahn problem, that is the minimization of the principal eigenvalue of the Dirichlet Laplacian in a domain with fixed Lebesgue measure. We then consider the case of the Laplacian with a bounded drift, that is the operator $- Δ + v \cdot \nabla$ , for which the minimization problem is still well posed. Next, we deal with...

Currently displaying 1601 – 1620 of 1688