Graphs on n vertices with signless Laplacian index at or above a threshold depending on n contain a trebly chorded cycle unless they are two exceptional graphs.
Then g′ 1(x) = 4x3 −(3n+ 45)x 2 + (32n+ 116)x−80n+ 24, g′′ 1(x) = 12x2 −(6n+ 90)x+ 32n+ 116
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Signless Laplacian index conditions for trebly chorded cycles in graphs with given order
Graphs on n vertices with signless Laplacian index at or above a threshold depending on n contain a trebly chorded cycle unless they are two exceptional graphs.