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It seems that undue weight is being given to "Murty's survey paper" in this article. While a survey paper might be useful for background, I fail to see why it would be considered notable. At best, maybe footnotable. 70.247.162.84 ( talk) 22:50, 18 August 2012 (UTC) reply

Perhaps it should be ${\displaystyle \lambda (G):=max_{i>0}|\lambda _{i}|}$, like in the expander graph article. — Preceding unsigned comment added by 178.38.179.63 ( talk) 12:18, 11 December 2014 (UTC) reply