Subdirect sums of QN-matrices
Lei Gao, Hui Huang, Chaoqian Li · Linear and Multilinear Algebra · 2018
Some sufficient conditions ensuring that the subdirect sum of QN-matrices is in the class of QN-matrices, are given. In particular, new conditions are given to guarantee that the k-subdirect sum of Nekrasov matrices is also a Nekrasov matrix. Examples are reported to illustrate the theoretical results presented.