84 citations · 657 across the 85 of their papers we have counts for
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Numerical ranges of cyclic shift matrices
Mao-Ting Chien, Steve Kirkland, Chi-Kwong Li +1
We study the numerical range of an cyclic shift matrix, which can be viewed as the adjacency matrix of a directed cycle with weighted arcs. In particular, we consid…
Cliques and independent subgroups of the Birkhoff polytope graph
Zejun Huang, Chi-Kwong Li, Eric Swartz +1
The Birkhoff polytope is the polytope of doubly stochastic matrices of order . The Birkhoff polytope graph is the skeleton of ; it is the Cayley graph whose…
Minimum number of non-zero-entries in a stable matrix
Christopher Hambric, Chi-Kwong Li, Diane Christine Pelejo +1
We prove that if a matrix is potentially stable, then it has at least 11 non-zero entries. The results for matrix with up to 6 are known previously. We…
Factorization of permutations
Zejun Huang, Chi-Kwong Li, Sharon H. Li +1
We consider the problem of factoring permutations as a product of special types of transpositions, namely, those transpositions involving two positions with bounded distances. In p…
Perfect partition of some regular bipartite graphs
Chi-Kwong Li, Jeff Soosiah, Gexin Yu
A graph has a perfect partition if all its perfect matchings can be partitioned so that each part is a 1-factorization of the graph. Let . We first gi…