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首页> 外文期刊>Annales scientifiques de l'Ecole normale superieure >A NEW PROOF OF FRIEDMAN'S SECOND EIGENVALUE THEOREM AND ITS EXTENSION TO RANDOM LIFTS
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A NEW PROOF OF FRIEDMAN'S SECOND EIGENVALUE THEOREM AND ITS EXTENSION TO RANDOM LIFTS

机译:弗里德曼第二个特征值定理的新证明及其对随机升降机的延伸

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摘要

It was conjectured by Alon and proved by Friedman that a random d-regular graph has nearly the largest possible spectral gap, or, more precisely, that the largest absolute value of the nontrivial eigenvalues of its adjacency matrix is at most 2√d-1 + o(l) with probability tending to one as the size of the graph tends to infinity. We give a new proof of this statement. We also study related questions on random n -lifts of graphs and improve a recent result by Friedman and Kohler.
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