Construction of real skew-symmetric matrices from interlaced spectral data and graph
arXiv:1412.6085 · doi:10.1016/j.laa.2015.01.001
Abstract
A 1989 result of Duarte asserts that for a given tree T on n vertices, a fixed vertex i, and two sets of distinct real numbers L, M of sizes n and n-1, respectively, such that M strictly interlaces L, there is a real symmetric matrix A such that graph of A is T, eigenvalues of A are given by L, and eigenvalues of A(i) are given by M. In 2013, a similar result for connected graphs was published by Hassani Monfared and Shader, using the Jacobian method. Analogues of these results are presented here for real skew-symmetric matrices whose graphs belong to a certain family of trees, and all of their supergraphs.
arXiv comment28 pages, accepted for publication in Linear Algebra and its Application, 2014