Search for dissertations about: "inverses"

Showing result 1 - 5 of 9 swedish dissertations containing the word inverses.

  2. 1. Preconditioners and fundamental solutions

    Author : Per Sundqvist; Henrik Brandén; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Numerical Analysis; Numerisk analys;

    Abstract : New preconditioning techniques for the iterative solution of systems of equations arising from discretizations of partial differential equations are considered. Fundamental solutions, both of differential and difference operators, are used as kernels in discrete, truncated convolution operators. READ MORE

  4. 2. Precise Reasoning About Non-strict Functional Programs; How to Chase Bottoms, and How to Ignore Them

    Author : Nils Anders Danielsson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; partial; inductive; coinductive; non-strict; equational reasoning; lifted; infinite; functional programming;

    Abstract : This thesis consists of two parts. Both concern reasoning about non-strict functional programming languages with partial and infinite values and lifted types, including lifted function spaces.The first part is a case study in program verification: We have written a simple parser and a corresponding pretty-printer in Haskell. READ MORE

  5. 3. Some Resolvent Estimates in Harmonic Analysis

    Author : Anders Dahlner; Matematik (naturvetenskapliga fakulteten); []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; field theory; Number Theory; algebra; algebraic geometry; Talteori; group theory; Tauberian theorem. Quantitative inversion. Cesaro operator. Bishops property beta.; algebraisk geometri; fältteori; gruppteori;

    Abstract : This thesis contains three papers about three different estimates of resolvents in harmonic analysis. These papers are: Paper 1. ``A Wiener tauberian theorem for weighted convolution algebras of zonal functions on the automorphism group of the unit disc'' Paper 2. ``Uniform spectral radius and compact Gelfand transform'' Paper 3. READ MORE

  6. 4. Error-Correcting Codes Based on Chaotic Dynamical Systems

    Author : Håkan Andersson; Thomas Mittelholzer; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : This dissertation treats a novel class of error-correcting codes based on chaotic dynamical systems. The codes are defined over a continuous alphabet whereas the information that is to be transmitted belongs to a discrete set of symbols. Simple expressions can be given for the encoders, and the codewords can be described by a parity-check relation. READ MORE

  7. 5. A class of infinite dimensional stochastic processes with unbounded diffusion and its associated Dirichlet forms

    Author : John Karlsson; Jörg-Uwe Löbus; Torkel Erhardsson; Hans-Jürgen Engelbert; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : This thesis consists of two papers which focuses on a particular diffusion type Dirichlet form  where  Here  is the basis in the Cameron-Martin space, H, consisting of the Schauder functions, and ν denotes the Wiener measure.In Paper I, we let  vary over the space of wiener trajectories in a way that the diffusion operator A is almost everywhere an unbounded operator on the Cameron–Martin space. READ MORE