For graphs of girth g≥4, at most n-g Laplacian eigenvalues lie in [n-g-k+4,n]; the extremal graphs for k=1,2 and the girth-3 analogues are classified.
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Girth and Laplacian eigenvalue distribution
For graphs of girth g≥4, at most n-g Laplacian eigenvalues lie in [n-g-k+4,n]; the extremal graphs for k=1,2 and the girth-3 analogues are classified.