Abstract
In this paper, we consider the Galerkin method to approximate the solution of Volterra-Urysohn integral equations of second kind with a smooth kernel, using piecewise polynomial bases. We show that the exact solution is approximated with the order of convergence \(\mathcal {O}(h^{r})\) for the Galerkin method, whereas the iterated Galerkin solutions converge with the order \(\mathcal {O}(h^{2r})\) in uniform norm, where h is the norm of the partition and r is the smoothness of the kernel. For improving the accuracy of the approximate solution of the integral equation, the multi-Galerkin method is also discussed here and we prove that the exact solution is approximated with the order of convergence \(\mathcal {O}(h^{3r})\) in uniform norm for iterated multi-Galerkin method. Numerical examples are given to illustrate the theoretical results.
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Mandal, M., Nelakanti, G. (2017). Superconvergence Results for Volterra-Urysohn Integral Equations of Second Kind. In: Giri, D., Mohapatra, R., Begehr, H., Obaidat, M. (eds) Mathematics and Computing. ICMC 2017. Communications in Computer and Information Science, vol 655. Springer, Singapore. https://doi.org/10.1007/978-981-10-4642-1_31
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DOI: https://doi.org/10.1007/978-981-10-4642-1_31
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