1. CMB 2017 (vol 60 pp. 807)
 Liu, Zhongyun; Qin, Xiaorong; Wu, Nianci; Zhang, Yulin

The Shifted Classical Circulant and Skew Circulant Splitting Iterative Methods for Toeplitz Matrices
It is known that every Toeplitz matrix $T$ enjoys a circulant
and skew circulant splitting (denoted by CSCS)
i.e., $T=CS$ with $C$ a circulant matrix and $S$ a skew circulant
matrix. Based on the variant of such a splitting (also referred
to as CSCS), we first develop classical CSCS iterative methods
and then introduce shifted CSCS iterative methods for solving
hermitian positive definite Toeplitz systems in this paper. The
convergence of each method is analyzed. Numerical experiments
show that the classical CSCS iterative methods work slightly
better than the GaussSeidel (GS) iterative methods if the CSCS
is convergent, and that there is always a constant $\alpha$ such
that the shifted CSCS iteration converges much faster than the
GaussSeidel iteration, no matter whether the CSCS itself is
convergent or not.
Keywords:Hermitian positive definite, CSCS splitting, GaussSeidel splitting, iterative method, Toeplitz matrix Categories:15A23, 65F10, 65F15 

2. CMB 2016 (vol 60 pp. 269)
 Chen, Jianlong; Zhu, Huihui; Patricio, Pedro; Zhang, Yulin

Characterizations and Representations of Core and Dual Core Inverses
In this
paper,
double commutativity and the reverse order law for the core inverse
are considered. Then, new characterizations of the MoorePenrose
inverse of a regular element are given by onesided invertibilities
in a ring. Furthermore, the characterizations and representations
of
the core and dual core inverses of a regular element are considered.
Keywords:regularities, group inverses, MoorePenrose inverses, core inverses, dual core inverses, Dedekindfinite rings Categories:15A09, 15A23 

3. CMB 1998 (vol 41 pp. 178)