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math.CO2022
Incidence matrices and line graphs of mixed graphs
Mohammad Abudayah, Omar Alomari, Torsten Sander
In the theory of line graphs of undirected graphs there exists an important theorem linking the incidence matrix of the root graph to the adjacency matrix of its line graph. For di…
math.CO2018
Spectrum of free-form Sudoku graphs
Mohammad Abudayah, Omar Alomari, Torsten Sander
A free-form Sudoku puzzle is a square arrangement of m times m cells such that the cells are partitioned into m subsets (called blocks) of equal cardinality. The goal of the puzzle…