## A convergence theorem for a class of Nyström methods for weakly singular integral equations on surfaces in $\mathbb {R}^3$

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- by Oscar Gonzalez and Jun Li PDF
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**84**(2015), 675-714 Request permission

## Abstract:

A convergence theorem is proved for a class of Nyström methods for weakly singular integral equations on surfaces in three dimensions. Fredholm equations of the second kind as arise in connection with linear elliptic boundary value problems for scalar and vector fields are considered. In contrast to methods based on product integration, coordinate transformation and singularity subtraction, the family of Nyström methods studied here is based on a local polynomial correction determined by an auxiliary system of moment equations. The polynomial correction is shown to remove the weak singularity in the integral equation and provide control over the approximation error. Convergence results for the family of methods are established under minimal regularity assumptions consistent with classic potential theory. Rates of convergence are shown to depend on the regularity of the problem, the degree of the polynomial correction, and the order of the quadrature rule employed in the discretization. As a corollary, a simple method based on singularity subtraction which has been employed by many authors is shown to be convergent.## References

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## Additional Information

**Oscar Gonzalez**- Affiliation: Department of Mathematics, The University of Texas at Austin, Austin, Texas 78712
- Email: og@math.utexas.edu
**Jun Li**- Affiliation: Graduate Program in Computational and Applied Mathematics, The University of Texas at Austin, Austin, Texas 78712
- Address at time of publication: Schlumberger Corporation, Houston, Texas
- Email: JLi49@slb.com
- Received by editor(s): December 29, 2011
- Received by editor(s) in revised form: June 3, 2013
- Published electronically: July 2, 2014
- Additional Notes: This work was supported by the National Science Foundation.
- © Copyright 2014 American Mathematical Society
- Journal: Math. Comp.
**84**(2015), 675-714 - MSC (2010): Primary 65R20, 65N38; Secondary 45B05, 31B20
- DOI: https://doi.org/10.1090/S0025-5718-2014-02869-X
- MathSciNet review: 3290960