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arxiv: math/0506260 · v1 · submitted 2005-06-13 · 🧮 math.CO

Eigenvalue problems of Nordhaus-Gaddum type

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keywords boundseigenvaluesproblemcomplementcorrespondingeigenvalueessentiallygave
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In 1970 Nosal gave upper and lower bounds on the sum of the spectral radii of a graph and its complement. We generalize this problem to other eigenvalues and give a number of bounds. We essentially solve the corresponding problem for the second eigenvalues.

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