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arxiv: 1407.4285 · v1 · pith:4MH5T47Tnew · submitted 2014-07-16 · 🧮 math.CO

Spectral radius minus average degree: a better bound

classification 🧮 math.CO
keywords averagedegreeradiusspectraladjacencybetterboundbounds
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Collatz and Sinogowitz had proposed to measure the departure of a graph $G$ from regularity by the difference of the (adjacency) spectral radius and the average degree: $\epsilon(G)=\rho(G)-\frac{2m}{n}$. We give here new lower bounds on this quantity, which improve upon the currently known ones.

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