Let H^n_2(d)$H^n_2(d)$ be the Cayley graph with vertex set {0,1}^n$\{0,1\}^n$ where two strings form an edge iff they have Hamming distance at least d$d$. What is the inertia of these graphs, that is, the numbers of positive, negative and zero eigenvalues? Thank you.
Peter Heinig
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