Eigenvalue problems of Nordhaus-Gaddum type
classification
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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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