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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Integral equations and operator theory 13 (1990), S. 104-131 
    ISSN: 1420-8989
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Banach algebras of certain bounded operators acting on the half-spaceL p (R + n+1 ,x 0 α ) (1〈p〈∞, −1〈α〈p−1) are defined which contain for example Wiener-Hopf operators, defined by multidimensional singular convolution integral operators, as well as certain singular integral operators with fixed singularities. Moreover the symbol may be a positive homogeneous function only piecewise continuous on the unit sphere. Actually these multidimensional singular integral operators may be not Calderón-Zygmund operators but are built up by those in lower dimensions. This paper is a continuation of a joint paper of the author together with R.V. Duduchava [10]. The purpose is to investigate invertibility or Fredholm properties of these operators, while the continuity is given by definition. This is done in [10] forp=2 and −1〈α〈1, and in the present paper forL p (R + n+1 ,x 0 α ) with 1〈p〈∞ and −1〈α〈p−1.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2023-11-03
    Description: We consider a stochastic optimal exit time feedback control problem. The Bellman equation is solved approximatively via the Policy Iteration algorithm on a polynomial ansatz space by a sequence of linear equations. As high degree multi-polynomials are needed, the corresponding equations suffer from the curse of dimensionality even in moderate dimensions. We employ tensor-train methods to account for this problem. The approximation process within the Policy Iteration is done via a Least-Squares ansatz and the integration is done via Monte-Carlo methods. Numerical evidences are given for the (multi dimensional) double well potential and a three-hole potential.
    Language: English
    Type: article , doc-type:article
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