الفهرس 
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Abstract
We have investigated four different systems of linear algebraic equations arising
from plane singular boundary-value problems for Laplace’s equation in rectangular
regions, with the aim of comparing the efficiency of three methods of solution: the
QR-Factorization Method contaminated with noise, the Dynamical systems
Method and the Variational Regularization Method. In each case, we have studied
thoroughly the matrix of coefficients.
We have reached some conclusions concerning the relative efficiency of the
three above-mentioned methods of solution. Moreover, it turns out that it is the
minimum singular value of the matrix of coefficients, and not the condition
number, that intervenes in determining the efficiency of the QR-Factorization
Method.