scholarly journals A new class of fredholm integral equations of the second kind with non symmetric kernel: solving by wavelets method

2021 ◽  
Vol 39 (6) ◽  
pp. 67-80
Author(s):  
Abdelaziz Mennouni ◽  
Nedjem Eddine Ramdani ◽  
Khaled Zennir

In this paper, we present an ecient modication of the wavelets method to solve a new class of Fredholm integral equations of the second kind with non symmetric kernel. This -analytical method based on orthonormal wavelet basis, as a consequence three systems are obtained, a Toeplitz system and two systems with condition number close to 1. Since the preconditioned conjugate gradient normal equation residual (CGNR) and preconditioned conjugate gradient normal equation error (CGNE) methods are applicable, we can solve the systems in O(2n log(n)) operations, by using the fast wavelet transform and the fast Fourier transform.

2018 ◽  
Vol 15 (06) ◽  
pp. 1850050 ◽  
Author(s):  
Panagiotis E. Kyziropoulos ◽  
Christos K. Filelis-Papadopoulos ◽  
George A. Gravvanis

A new class of symmetric factored approximate inverses is proposed and used in conjunction with the Preconditioned Conjugate Gradient method for solving sparse symmetric linear systems. Additionally, a new hybrid two-level solver is proposed utilizing a block independent set reordering, in order to create the two level hierarchy. The Schur complement is formed explicitly by inverting the blocks created by reordering. Then, the preconditioned conjugate gradient method is used in conjunction with the symmetric factored approximate inverse to solve the reduced order linear system. Furthermore, numerical results on the performance and convergence behavior for solving various model problems are presented.


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