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math.CO2003
On the structure of the adjacency matrix of the line digraph of a regular digraph
Simone Severini
We show that the adjacency matrix M of the line digraph of a d-regular digraph D on n vertices can be written as M=AB, where the matrix A is the Kronecker product of the all-ones m…
cs.DM2003
On a composition of digraphs
Simone Severini
Many "good" topologies for interconnection networks are based on line digraphs of regular digraphs. These digraphs support unitary matrices. We propose the property "being the digr…