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| Paper IPM / M / 11291 |
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| Abstract: | |||||
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Let a graph \mathnormalΓ be locally disjoint union of three copies of complete graphs Kq−1 and
let \mathnormalΓ be cospectral with the Hamming graph H(3,q).
Bang and Koolen [Asian-Eur. J. Math. 1 (2008), 147-156] proved that
if q > 3, then \mathnormalΓ is isomorphic to H(3,q).
We present a short proof of this result.
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