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A Proof of Alon's Second Eigenvalue Conjecture and Related Problems
A Proof of Alon's Second Eigenvalue Conjecture and Related Problems
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Author(s): Friedman, Joel
ISBN No.: 9780821842805
Pages: 100
Year: 200808
Format: Trade Paper
Price: $ 102.20
Dispatch delay: Dispatched between 7 to 15 days
Status: Available

A $d$-regular graph has largest or first (adjacency matrix) eigenvalue $\lambda_1=d$. Consider for an even $d\ge 4$, a random $d$-regular graph model formed from $d/2$ uniform, independent permutations on $\{1,\ldots,n\}$. The author shows that for any $\epsilon>0$ all eigenvalues aside from $\lambda_1=d$ are bounded by $2\sqrt{d-1}\;+\epsilon$ with probability $1-O(n^{-\tau})$, where $\tau=\lceil \bigl(\sqrt{d-1}\;+1\bigr)/2 \rceil-1$. He also shows that this probability is at most $1-c/n^{\tau'}$, for a constant $c$ and a $\tau'$ that is either $\tau$ or $\tau+1$ (''more often'' $\tau$ than $\tau+1$). He proves related theorems for other models of random graphs, including models with $d$ odd.


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