Sökning: "Per Alexandersson"

Hittade 2 avhandlingar innehållade orden Per Alexandersson.

  1. 1. Combinatorial Methods in Complex Analysis

    Detta är en avhandling från Stockholm : Department of Mathematics, Stockholm University

    Författare :Per Alexandersson; Stockholms universitet.; [2013]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; combinatorics; Schrödinger equation; Toeplitz matrix; sums of squares; Schur polynomials; matematik; Mathematics;

    Sammanfattning : The theme of this thesis is combinatorics, complex analysis and algebraic geometry. The thesis consists of six articles divided into four parts.Part A: Spectral properties of the Schrödinger equationThis part consists of Papers I-II, where we study a univariate Schrödinger equation with a complex polynomial potential. LÄS MER

  2. 2. On eigenvalues of the Schrödinger operator with a complex-valued polynomial potential

    Detta är en avhandling från Stockholm : Department of Mathematics

    Författare :Per Alexandersson; Stockholms universitet.; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; schroedinger; even spectral determinant polynomial potential eigenvalue; MATHEMATICS Algebra; geometry and mathematical analysis Mathematical analysis; MATEMATIK Algebra; geometri och analys Analys; Mathematics; matematik;

    Sammanfattning : In this thesis, we generalize a recent result of A. Eremenko and A. Gabrielov on irreducibility of the spectral discriminant for the Schroedinger equation with quartic potentials. LÄS MER