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when toggle format what by license comment
Jan 27, 2023 at 4:52 comment added Fedor Petrov For what it worth, if $k=\mu-\lambda$ is negative but of order $n$, this is possible only for complete graphs: it remains to consider the case $x=-1$, which reads as $\lambda=d-1$ that holds only for complete graphs.
Jan 26, 2023 at 17:03 vote accept Lior Gishboliner
Jan 26, 2023 at 9:30 history answered Fedor Petrov CC BY-SA 4.0