<p>The Cauchy problem for an evolution equation with a fractional derivative and a strongly positive operator coefficient in Banach space is considered. The exact solution to the problem is represented as a series in terms of the Cayley transform of the operator coefficient and the Laguerre–Cayley polynomials. A partial sum of this series is used to construct an approximate solution. Estimates of the error of such an approximation are obtained, indicating an exponential rate of convergence for the proposed method. The theoretical results are illustrated by numerical examples.</p>

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Exponentially Convergent Method for Solving a Fractional-Order Evolution Equation in a Banach Space

  • V. L. Makarov,
  • N. V. Mayko,
  • V. L. Ryabichev

摘要

The Cauchy problem for an evolution equation with a fractional derivative and a strongly positive operator coefficient in Banach space is considered. The exact solution to the problem is represented as a series in terms of the Cayley transform of the operator coefficient and the Laguerre–Cayley polynomials. A partial sum of this series is used to construct an approximate solution. Estimates of the error of such an approximation are obtained, indicating an exponential rate of convergence for the proposed method. The theoretical results are illustrated by numerical examples.