Algebraic and differential properties of polynomial Fourier transformation

S.V. Sharyn

doi:10.30970/ms.53.1.59-68

S.V. Sharyn Vasyl Stefanyk Precarpathian National University, Ukraine

DOI: https://doi.org/10.30970/ms.53.1.59-68

Keywords: polynomials on infinite-dimensional spaces; rapidly decreasing functions; Schwartz distributions; Fourier transformation

Abstract

Methods of integral transformations of (generalized) functions are widely used in the solution of initial and boundary value problems for partial differential equations. However, many problems in applied mathematics require a nonlinear generalization of distribution spaces. Besides, an algebraic structure of a space of distributions is desirable, which is needed, for example, in quantum field theory.
In the article, we use the adjoint operator method as well as technique of symmetric tensor products to extended the Fourier transformation onto the spaces of so-called polynomial rapidly decreasing test functions and polynomial tempered distributions. In such spaces it is possible to solve some Cauchy problems, for example, infinite dimensional heat equation associated with the Gross Laplacian.
Algebraic and differential properties of the polynomial Fourier transformation are investigated. We prove some analogical to classical properties of this map. Unlike to the classic case, the spaces of polynomial test and generalized functions have algebraic structure. We prove that polynomial Fourier transformation acts as homomorphism of appropriate algebras. It is clear that the classical analogue of such property is absent.

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