• Deutsch
    • English
  • Publish
  • About KOBRA  
    • About us
    • Policy
    • License
    • FAQ
    • Contact
  • 🇬🇧
    • Deutsch
    • English
  • Login
Search 
  •   KOBRA
  • Fachbereiche
  • FB 10 / Mathematik und Naturwissenschaften
  • Institut für Mathematik
  • Mathematische Schriften Kassel
  • Search
  •   KOBRA
  • Fachbereiche
  • FB 10 / Mathematik und Naturwissenschaften
  • Institut für Mathematik
  • Mathematische Schriften Kassel
  • Search
JavaScript is disabled for your browser. Some features of this site may not work without it.


Diese Webseite benutzt Cookies.
COOKIE POLICY DER UNI. Close


Search

Show Advanced FiltersHide Advanced Filters

Filters

Use filters to refine the search results.

Now showing items 1-9 of 9

  • Sort Options:
  • Relevance
  • Title Asc
  • Title Desc
  • Issue Date Asc
  • Issue Date Desc
  • Results Per Page:
  • 5
  • 10
  • 20
  • 40
  • 60
  • 80
  • 100
Thumbnail

Preprint Existence of parameterized BV-solutions for rate-independent systems with discontinuous loads 

Knees, Dorothee; Zanini, Chiara (2019-09-25)
We study a rate-independent system with non-convex energy and in the case of a time-discontinuous loading. We prove existence of the rate-dependent viscous regularization by time-incremental problems, while the existence of the so called parameterized BV-solutions is obtained via vanishing viscosity in a suitable parameterized setting. In addition, we prove that the solution set is compact.
Thumbnail

Preprint On Solution Sets of Information Inequalities 

Ay, Nihat; Wenzel, Walter (2011)
We investigate solution sets of a special kind of linear inequality systems. In particular, we derive characterizations of these sets in terms of minimal solution sets. The studied inequalities emerge as information inequalities in the context of Bayesian networks. This allows to deduce important properties of Bayesian networks, which is important within causal inference.
Thumbnail

Preprint Characterization theorem for classical orthogonal polynomials on non-uniform lattices: The functional approach 

Foupouagnigni, Mama; Kenfack Nangho, Maurice; Mboutngam, Salifou (2010)
Using the functional approach, we state and prove a characterization theorem for classical orthogonal polynomials on non-uniform lattices (quadratic lattices of a discrete or a q-discrete variable) including the Askey-Wilson polynomials. This theorem proves the equivalence between seven characterization properties, namely the Pearson equation for the linear functional, the second-order divided-difference equation, the orthogonality of the derivatives, the Rodrigues formula, two types of structure relations,and the ...
Thumbnail

Preprint On Solutions of Holonomic Divided-Difference Equations on Non-Uniform Lattices 

Foupouagnigni, Mama; Koepf, Wolfram; Kenfack Nangho, Maurice; Mboutngam, Salifou (2010)
The main aim of this paper is the development of suitable bases (replacing the power basis x^n (n\in\IN_\le 0) which enable the direct series representation of orthogonal polynomial systems on non-uniform lattices (quadratic lattices of a discrete or a q-discrete variable). We present two bases of this type, the first of which allows to write solutions of arbitrary divided-difference equations in terms of series representations extending results given in [16] for the q-case. Furthermore it enables the representation ...
Thumbnail

Preprint On the relationship between the Method of Least Squares and Gram-Schmidt orthogonalization 

Drygas, Hilmar (2010)
The method of Least Squares is due to Carl Friedrich Gauss. The Gram-Schmidt orthogonalization method is of much younger date. A method for solving Least Squares Problems is developed which automatically results in the appearance of the Gram-Schmidt orthogonalizers. Given these orthogonalizers an induction-proof is available for solving Least Squares Problems.
Thumbnail

Preprint Balanced Viscosity solutions to a rate-independent system for damage 

Knees, Dorothee; Rossi, Riccarda; Zanini, Chiara (2017-05-02)
This article is the third one in a series of papers by the authors on vanishing-viscosity solutions to rate-independent damage systems. While in the first two papers [KRZ13, KRZ15] the assumptions on the spatial domain $\Omega$ were kept as general as possible (i.e. nonsmooth domain with mixed boundary conditions), we assume here that $\partial\Omega$ is smooth and that the type of boundary conditions does not change. This smoother setting allows us to derive enhanced regularity spatial properties both for ...
Thumbnail

Preprint Convergence analysis of time-discretization schemes for rate-independent systems 

Knees, Dorothee (2017-12-21)
It is well known that rate-independent systems involving nonconvex energy functionals in general do not allow for time-continuous solutions even if the given data are smooth. In the last years, several solution concepts were proposed that include discontinuities in the notion of solution, among them the class of global energetic solutions and the class of BV-solutions. In general, these solution concepts are not equivalent and numerical schemes are needed that reliably approximate that type of solutions ...
Thumbnail

Preprint A free boundary approach to the Rosensweig instability of ferrofluids 

Parini, Enea; Stylianou, Athanasios (2017-04-18)
We establish the existence of saddle points for a free boundary problem describing the two-dimensional free surface of a ferrofluid which undergoes normal field instability (also known as Rosensweig instability). The starting point consists in the ferro-hydrostatic equations for the magnetic potentials in the ferrofluid and air, and the function describing their interface. The former constitute the strong form for the Euler-Lagrange equations of a convex-concave functional. We extend this functional in order to ...
Thumbnail

Preprint On the existence of symmetric minimizers 

Stylianou, Athanasios (2018-01-23)
In this note we revisit a less known symmetrization method for functions with respect to a topological group, which we call G-averaging. We note that, although quite non-technical in nature, this method yields G-invariant minimizers of functionals satisfying some relaxed convexity properties. We give an abstract theorem and show how it can be applied to the p-Laplace and polyharmonic Poisson problem in order to construct symmetric solutions. We also pose some open problems and explore further possibilities where the ...

DSpace software copyright © 2002-2015  DuraSpace
KOBRA copyright © 2006-2018  UB Kassel
Contact Us | Send Feedback | Impressum / Datenschutz
Theme by 
Atmire NV
 

 

Browse

All of KOBRACommunities & CollectionsBy Issue Date Authors Titles Keyword (DDC)Keyword (GND)Publication type Language Open access This CollectionBy Issue Date Authors Titles Keyword (DDC)Keyword (GND)Publication type Language Open access

Discover

  • Date Issued 2019 (1) 2018 (1) 2017 (3) 2011 (1) 2010 (3)
  • Publication typePreprint  (9)
  • Keyword (DDC)510  Mathematics  (9)
  • Open access open access (9)

DSpace software copyright © 2002-2015  DuraSpace
KOBRA copyright © 2006-2018  UB Kassel
Contact Us | Send Feedback | Impressum / Datenschutz
Theme by 
Atmire NV