The graph with spectrum 14^1 2^40 (−4)^10 (−6)^9

A. Blokhuis, A.E. Brouwer, W.H. Haemers

Research output: Contribution to journalArticleScientificpeer-review


We show that there is a unique graph with spectrum as in the title. It is a subgraph of the McLaughlin graph. The proof uses a strong form of the eigenvalue interlacing theorem to reduce the problem to one about root lattices.
Original languageEnglish
Pages (from-to)71-75
JournalDesigns Codes and Cryptography
Issue number1-2
Publication statusPublished - 2012


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