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**On unsymmetric collocation by radial basis functions.**
*(English)*
Zbl 1026.65107

Summary: Solving partial differential equations by collocation with radial basis functions can be efficiently done by a technique first proposed by E. J. Kansa [Comput. Math. Appl. 19, No. 8/9, 127-145 (1990; Zbl 0692.76003); ibid. 19, No. 8/9, 147-161 (1990; Zbl 0850.76048)]. It rewrites the problem as a generalized interpolation problem, and the solution is obtained by solving a (possibly large) linear system. The method has been used successfully in a variety of applications, but a proof of nonsingularity of the linear system was still missing. This paper shows that a general proof of this fact is impossible. However, numerical evidence shows that cases of singularity are rare and have to be constructed with quite some effort.

### MSC:

65N35 | Spectral, collocation and related methods for boundary value problems involving PDEs |

35J05 | Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation |

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\textit{Y. C. Hon} and \textit{R. Schaback}, Appl. Math. Comput. 119, No. 2--3, 177--186 (2001; Zbl 1026.65107)

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### References:

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