Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Functional calculus for generators of symmetric contraction semigroups  [PDF]
Andrea Carbonaro,Oliver Dragi?evi?
Mathematics , 2013,
Abstract: We prove that every generator of a symmetric contraction semigroup on a $\sigma$-finite measure space admits, for $1
Contraction semigroups of elliptic quadratic differential operators  [PDF]
Karel Pravda-Starov
Mathematics , 2007,
Abstract: We study the contraction semigroups of elliptic quadratic differential operators. Elliptic quadratic differential operators are the non-selfadjoint operators defined in the Weyl quantization by complex-valued elliptic quadratic symbols. We establish in this paper that under the assumption of ellipticity, as soon as the real part of their Weyl symbols is a non-zero non-positive quadratic form, the norm of contraction semigroups generated by these operators decays exponentially in time.
Contraction semigroups on metric graphs  [PDF]
Vadim Kostrykin,Jurgen Potthoff,Robert Schrader
Mathematics , 2007,
Abstract: The main objective of the present work is to study contraction semigroups generated by Laplace operators on metric graphs, which are not necessarily self-adjoint. We prove criteria for such semigroups to be continuity and positivity preserving. Also we provide a characterization of generators of Feller semigroups on metric graphs.
Hardy inequalities and non-explosion results for semigroups  [PDF]
Krzysztof Bogdan,Bart?omiej Dyda,Panki Kim
Mathematics , 2014,
Abstract: We prove non-explosion results for Schr\"odinger perturbations of symmetric transition densities and Hardy inequalities for their quadratic forms by using explicit supermedian functions of their semigroups.
Chen’s Inequalities for Submanifolds in (ĸ, µ)-Contact Space Form with a Semi-Symmetric Non-Metric Connection  [PDF]
Asif Ahmad, Faisal Shahzad, Jing Li
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.62037
Abstract: In this paper, we obtain Chen’s inequalities in (k,?μ)-contact space form with a semi-symmetric non-metric connection. Also we obtain the inequalites for Ricci and K-Ricci curvatures.
Interval Semigroups  [PDF]
W. B. Vasantha Kandasamy,Florentin Smarandache
Mathematics , 2011,
Abstract: In this book we introduce the notion of interval semigroups using intervals of the form [0, a], a is real. Several types of interval semigroups like fuzzy interval semigroups, interval symmetric semigroups, special symmetric interval semigroups, interval matrix semigroups and interval polynomial semigroups are defined and discussed. This book has eight chapters. The main feature of this book is that we suggest 241 problems in the eighth chapter. In this book the authors have defined 29 new concepts and illustrates them with 231 examples. Certainly this will find several applications.
Symmetries on almost symmetric numerical semigroups  [PDF]
Hirokatsu Nari
Mathematics , 2011,
Abstract: The notion of almost symmetric numerical semigroup was given by V. Barucci and R. Fr\"oberg. We characterize almost symmetric numerical semigroups by symmetry of pseudo-Frobenius numbers. We give a criterion for $H^*$ (the dual of $M$) to be almost symmetric numerical semigroup. Using these results we give a formula for multiplicity of an opened modular numerical semigroups. Finally, we show that if $H_1$ or $H_2$ is not symmetric, then the gluing of $H_1$ and $H_2$ is not almost symmetric.
Schur-Weyl dualities for symmetric inverse semigroups  [PDF]
Ganna Kudryavtseva,Volodymyr Mazorchuk
Mathematics , 2007,
Abstract: We obtain Schur-Weyl dualities in which the algebras, acting on both sides, are semigroup algebras of various symmetric inverse semigroups and their deformations.
Semigroup Closures of Finite Rank Symmetric Inverse Semigroups  [PDF]
Oleg Gutik,Jimmie Lawson,Du?an Repov?
Mathematics , 2008, DOI: 10.1007/s00233-008-9112-2
Abstract: We introduce the notion of semigroup with a tight ideal series and investigate their closures in semitopological semigroups, particularly inverse semigroups with continuous inversion. As a corollary we show that the symmetric inverse semigroup of finite transformations $\mathscr{I}_\lambda^n$ of the rank $\leqslant n$ is algebraically closed in the class of (semi)topological inverse semigroups with continuous inversion. We also derive related results about the nonexistence of (partial) compactifications of classes of semigroups that we consider.
Phi-entropy inequalities for diffusion semigroups  [PDF]
Fran?ois Bolley,Ivan Gentil
Mathematics , 2008,
Abstract: We obtain and study new $\Phi$-entropy inequalities for diffusion semigroups, with Poincar\'e or logarithmic Sobolev inequalities as particular cases. From this study we derive the asymptotic behaviour of a large class of linear Fokker-Plank type equations under simple conditions, widely extending previous results. Nonlinear diffusion equations are also studied by means of these inequalities. The $\Gamma_2$ criterion of D. Bakry and M. Emery appears as a main tool in the analysis, in local or integral forms.
Page 1 /100
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.