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math.CO2025
On the difference of the intersection power graph and the power graph of a finite group
Sudip Bera, Peter J. Cameron
The difference graph D(G) of a finite group G is the graph obtained by taking the (edge) difference of the intersection power graph and the power graph of G, and subsequently remov…
math.CO2025
A new look at twin reduction
Peter J. Cameron
Twin reduction defines an equivalence relation on the vertex set of a graph. I give a characterisation of this equivalence relation. A consequence is a structure theorem for the au…