On the sum of k largest singular values of graphs and matrices
In the recent years, the trace norm of graphs has been extensively studied under the name of graph energy. The trace norm is just one of the Ky Fan k-norms, given by the sum of the k largest singular values, which are studied more generally in the present paper. Several relations to chromatic number, spectral radius, spread, and to other fundamental parameters are outlined. Some results are extended to more general matrices. © 2010 Published by Elsevier Inc.
Linear Algebra and Its Applications
Nikiforov, V. (2011). On the sum of k largest singular values of graphs and matrices. Linear Algebra and Its Applications, 435 (10), 2394-2401. https://doi.org/10.1016/j.laa.2010.08.014