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math.CO2026
Optimization problem for star covers of graphs without four cycles
Damjana Kokol Bukovšek, Polona Oblak, Helena Šmigoc
This work presents a study of star covers on graphs. Unlike traditional formulations that minimize the number of stars, our aim is to optimize the number of bipartite components us…
math.CO2026
Combinatorial aspects of the non-symmetric strong spectral property for graphs
Sara Koljančić, Polona Oblak
In this paper, we investigate the non-symmetric Strong Spectral Property (nSSP) from a combinatorial perspective. To zero-nonzero patterns of matrices we associate directed graphs…