2 papers
math.CO2026
Unbalanced signed bipartite graphs containing no negative with maximum spectral radius
Yiting Cai, Hongying Lin, Bo Zhou
A signed graph is a graph together with an assignment of either a positive sign or a negative sign to each edge. A signed graph is unbalanced if it contains a cyc…
math.CO2025
Extremal distance spectral radius of graphs with fixed size
Hongying Lin, Bo Zhou
Let be a positive integer. Brualdi and Hoffman proposed the problem to determine the (connected) graphs with maximum spectral radius in a given graph class and they posed a con…