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Galerkin finite element method and error analysis for the fractional cable equation

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Abstract

The cable equation is one of the most fundamental equations for modeling neuronal dynamics. These equations can be derived from the Nernst-Planck equation for electro-diffusion in smooth homogeneous cylinders. Fractional cable equations are introduced to model electrotonic properties of spiny neuronal dendrites. In this paper, a Galerkin finite element method(GFEM) is presented for the numerical simulation of the fractional cable equation(FCE) involving two integro-differential operators. The proposed method is based on a semi-discrete finite difference approximation in time and Galerkin finite element method in space. We prove that the numerical solution converges to the exact solution with order O(τ+h l+1) for the lth-order finite element method. Further, a novel Galerkin finite element approximation for improving the order of convergence is also proposed. Finally, some numerical results are given to demonstrate the theoretical analysis. The results show that the numerical solution obtained by the improved Galerkin finite element approximation converges to the exact solution with order O(τ 2+h l+1).

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Authors and Affiliations

  1. School of Mathematical Sciences, Xiamen University, Xiamen, 361005, China

    P. Zhuang

  2. School of Mathematical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, QLD, 4001, Australia

    F. Liu, I. Turner & V. Anh

  3. Fujian Provincial Key Laboratory of Mathematical Modeling and High-Performance Scientific Computation, Xiamen University, Xiamen, 361005, China

    P. Zhuang

Authors
  1. P. Zhuang
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  2. F. Liu
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  3. I. Turner
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  4. V. Anh
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Correspondence to F. Liu.

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Zhuang, P., Liu, F., Turner, I. et al. Galerkin finite element method and error analysis for the fractional cable equation. Numer Algor 72, 447–466 (2016). https://doi.org/10.1007/s11075-015-0055-x

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  • DOI: https://doi.org/10.1007/s11075-015-0055-x

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