1 citations · 1 across the 2 of their papers we have counts for
3 papers
math.CO2021
Self-converse mixed graphs are extremely rare
Pepijn Wissing
A mixed graph is cospectral to its converse, with respect to the usual adjacency matrices. Hence, it is easy to see that a mixed graph whose eigenvalues occur uniquely, up to isomo…
math.CO2021★ 1 cited
Unit gain graphs with two distinct eigenvalue and systems of lines in complex space
Pepijn Wissing, Edwin R. van Dam
Since the introduction of the Hermitian adjacency matrix for digraphs, interest in so-called complex unit gain graphs has surged. In this work, we consider gain graphs whose spectr…
math.CO2019
The negative tetrahedron and the first infinite family of connected digraphs that are strongly determined by the Hermitian spectrum
Pepijn Wissing, Edwin R. van Dam
Thus far, digraphs that are uniquely determined by their Hermitian spectra have proven elusive. Instead, researchers have turned to spectral determination of classes of switching e…