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Keywords:
linear system; iterative method; $K$-nonnegativity; double splitting; convergence theorem; comparison theorem
linear system; iterative method; $K$-nonnegativity; double splitting; convergence theorem; comparison theorem
Summary:
Recently, Wang (2017) has introduced the $K$-nonnegative double splitting using the notion of matrices that leave a cone $K\subseteq \mathbb {R}^{n}$ invariant and studied its convergence theory by generalizing the corresponding results for the nonnegative double splitting by Song and Song (2011). However, the convergence theory for $K$-weak regular and $K$-nonnegative double splittings of type II is not yet studied. In this article, we first introduce this class of splittings and then discuss the convergence theory for these sub-classes of matrices. We then obtain the comparison results for two double splittings of a $K$-monotone matrix. Most of these results are completely new even for $K= \mathbb {R}^{n}_+$. The convergence behavior is discussed by performing numerical experiments for different matrices derived from the discretized Poisson equation.
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