Abstract
The structure of graphs whose largest eigenvalue is bounded by \(\frac{3}{2}\sqrt{2}\) (≈2.1312) is investigated. In particular, such a graph can have at most one circuit, and has a natural quipu structure.
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Woo, R., Neumaier, A. On Graphs Whose Spectral Radius is Bounded by \(\frac{3}{2}\sqrt{2}\). Graphs and Combinatorics 23, 713–726 (2007). https://doi.org/10.1007/s00373-007-0745-9
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DOI: https://doi.org/10.1007/s00373-007-0745-9