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  • 1. Bakan, Andrew
    et al.
    Kaijser, Sten
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics, Mathematics I -V.
    Hardy spaces for the strip2006Report (Other (popular scientific, debate etc.))
  • 2. Blanco, A.
    et al.
    Kaijser, Sten
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics.
    Ransford, T. J.
    Real interpolation of Banach algebras and factorization of weakly compact homomorphisms2004In: Journal of functional analysis, ISSN 1096-0783, Vol. 217, no 1, p. 126-141Article in journal (Refereed)
  • 3. Ekstig, Kerstin
    et al.
    Kaijser, Sten
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics.
    Kiselman, Christer O.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Visual Information and Interaction.
    Lindahl, Lars-Åke
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics.
    Vretblad, Anders
    Sonja Lyttkens: Minnesord2015In: Upsala Nya Tidning, Vol. 125, no 12, p. B13-B13Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    Sonja Lyttkens was born in 1919 and died in 2014. She was the second woman to get a PhD in mathematics in Sweden, and the first to become a university lecturer.

  • 4.
    Janson, Svante
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics, Analysis and Probability Theory.
    Kaijser, Sten
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics, Analysis and Probability Theory.
    Higher moments of Banach space valued random variables2015In: Memoirs of the American Mathematical Society, ISSN 0065-9266, E-ISSN 1947-6221, Vol. 238, no 1127, p. 1-110Article in journal (Refereed)
    Abstract [en]

    We define the k:th moment of a Banach space valued random variable as the expectation of its k: th tensor power; thus the moment (if it exists) is an element of a tensor power of the original Banach space. We study both the projective and injective tensor products, and their relation. Moreover, in order to be general and flexible, we study three different types of expectations: Bochner integrals, Pettis integrals and Dunford integrals. One of the problems studied is whether two random variables with the same injective moments (of a given order) necessarily have the same projective moments; this is of interest in applications. We show that this holds if the Banach space has the approximation property, but not in general. Several chapters are devoted to results in special Banach spaces, including Hilbert spaces, C(K) and D[0,1]. The latter space is non-separable, which complicates the arguments, and we prove various preliminary results on e.g. measurability in D[0,1] that we need. One of the main motivations of this paper is the application to Zolotarev metrics and their use in the contraction method. This is sketched in an appendix.

  • 5.
    Kaijser, Sten
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics.
    Biography of Matts Essén.2004In: Complex Var. Theory Appl., no 49, p. 7-9Article in journal (Other (popular scientific, debate etc.))
  • 6.
    Kaijser, Sten
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics, Mathematics I -V.
    Nikolova, L.
    Persson, Lars-Erik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics, Mathematics I -V.
    Hardy-type inequalities via convexity2005In: MATHEMATICAL INEQUALITIES & APPLICATIONS, Vol. 8, no 3, p. 403-417Article in journal (Refereed)
  • 7.
    Kaijser, Sten
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics.
    Persson, Lars-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics, Mathematics I -V.
    Öberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics, Analysis and Applied Mathematics.
    On Carleman and Knopp's inequalities2002In: Journal of Approximation Theory, ISSN 0021-9045, E-ISSN 1096-0430, Vol. 117, no 1, p. 140-151Article in journal (Refereed)
  • 8.
    Kaijser, Sten
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics, Mathematics I -V. matematik.
    Reinov, Oleg
    On $\alpha$-nuclearity and total accessibility for some tensor norms2001In: Acta et Comm. Univ. Tartu Math. 5 (2001) 59--64, Vol. 5, p. 59-Article in journal (Other (popular scientific, debate etc.))
  • 9.
    Kaijser, Sten
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics.
    Reinov, Oleg, I
    St Petersburg State Univ, Dept Math & Mech, St Petersburg 198504, Russia.
    Some approximation properties and nuclear operators in spaces of analytical functions2019In: ADVANCES IN OPERATOR THEORY, ISSN 2538-225X, Vol. 4, no 1, p. 265-283Article in journal (Refereed)
    Abstract [en]

    We introduce and investigate a new notion of the approximation property AP([c]), where c = (c(n)) is an arbitrary positive real sequence, tending to infinity. Also, we study the corresponding notion of [c]-nuclear operators in Banach spaces. Some characterization of the AP([c]) in terms of tensor products, as well as sufficient conditions for a Banach space to have the AP([c]), are given. We give also sufficient conditions for a positive answer to the question: When it follows from the [c]-nuclearity of an adjoint operator the nuclearity of the operator itself. Obtained results are applied then to the study of properties of nuclear operators in some spaces of analytical functions. Many examples are given.

  • 10.
    Kaijser, Sten
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics. matematik.
    Sigstam, Kibret
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics. matematik.
    A pseudo-metric structure on interpolation functors2001In: Acta et Comm. Univ. Tartu Math., Vol. 5, p. 15-Article in journal (Other (popular scientific, debate etc.))
    Abstract [en]

    We define a (pseudo-)metric on the set of all interpolation functors

  • 11.
    Musonda, John
    et al.
    Malardalen Univ, Div Appl Math, Box 883, S-72123 Vasteras, Sweden..
    Kaijser, Sten
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics.
    Three systems of orthogonal polynomials and L-2-boundedness of two associated operators2018In: Journal of Mathematical Analysis and Applications, ISSN 0022-247X, E-ISSN 1096-0813, Vol. 459, no 1, p. 464-475Article in journal (Refereed)
    Abstract [en]

    In this paper, we describe three systems of orthogonal polynomials belonging to the class of Meixner-Pollaczek polynomials, and establish some useful connections between them in terms of three basic operators that are related to them. Furthermore, we investigate boundedness properties of two other operators, both as convolution operators in the translation invariant case where we use Fourier transforms and for the weights related to the relevant orthogonal polynomials. We consider only the most important but also simplest case of L-2-spaces. However, in subsequent papers, we intend to extend the study to L-p-spaces (1 < p < infinity).

  • 12.
    Persson, Lars-Erik
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics, Mathematics I -V.
    Kaijser, Sten
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics, Mathematics I -V.
    Nikolova, L.
    On Hardy-type inequalities via convexity2005In: Math. Inequal. Appl, no 3, p. 403-417Article in journal (Refereed)
1 - 12 of 12
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