Sökning: "Matematiska Institutionen."

Visar resultat 16 - 20 av 773 avhandlingar innehållade orden Matematiska Institutionen..

  1. 16. Community detection : Lower bounds and axiomatic classification

    Författare :Vilhelm Agdur; Fiona Skerman; Tatyana Turova; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; community detection; graph clustering; graph theory; Mathematics with specialization in Applied Mathematics; Matematik med inriktning mot tillämpad matematik;

    Sammanfattning : .... LÄS MER

  3. 17. Limit Laws, Homogenizable Structures and Their Connections

    Författare :Ove Ahlman; Vera Koponen; Dugald Macpherson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Model theory; random structure; finite model theory; simple theory; homogeneous structure; countably categorical; 0-1 law; Mathematical Logic; Matematisk logik; Mathematics; Matematik;

    Sammanfattning : This thesis is in the field of mathematical logic and especially model theory. The thesis contain six papers where the common theme is the Rado graph R. Some of the interesting abstract properties of R are that it is simple, homogeneous (and thus countably categorical), has SU-rank 1 and trivial dependence. LÄS MER

  4. 18. On the Extension and Wedge Product of Positive Currents

    Författare :Ahmad Khalid Al Abdulaali; Jan-Erik Björk; Hassine El Mir; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Closed positive currents; plurisubharmonic currents; plurisubharmonic functions; pluripolar sets; k-convex functions; wedge product of currents; Mathematics; matematik;

    Sammanfattning : This dissertation is concerned with extensions and wedge products of positive currents. Our study can be considered as a generalization for classical works done earlier in this field. Paper I deals with the extension of positive currents across different types of sets. LÄS MER

  5. 19. Combinatorial Methods in Complex Analysis

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

    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

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

    Författare :Per Alexandersson; Boris Shapiro; Ilpo Laine; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; schroedinger; even spectral determinant polynomial potential eigenvalue; Mathematical analysis; 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