A ⋆-product solver with spectral accuracy for non-autonomous ordinary differential equations

09/30/2022

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by   Stefano Pozza, et al.

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A new method for solving non-autonomous ordinary differential equations is proposed, the method achieves spectral accuracy. It is based on a new result which expresses the solution of such ODEs as an element in the so called ⋆-algebra. This algebra is equipped with a product, the ⋆-product, which is the integral over the usual product of two bivariate distributions. Expanding the bivariate distributions in bases of Legendre polynomials leads to a discretization of the ⋆-product and this allows for the solution to be approximated by a vector that is obtained by solving a linear system of equations. The effectiveness of this approach is illustrated with numerical experiments.