2 papers
math.CO2025
The complexity of matroid homomorphism reconfiguration
Cheolwon Heo, Mark Siggers
We consider a reconfiguration version of the homomorphism problem for binary matroids . This reconfiguration problem, , asks…
math.CO2024
Spectral integral variation of signed graphs
Jungho Ahn, Cheolwon Heo, Sunyo Moon
We characterize when the spectral variation of the signed Laplacian matrices is integral after a new edge is added to a signed graph. As an application, for every fixed signed comp…