 This is analogous to the Cheeger-type inequality relating the spectral gap  , \lambda_2 (G), of the graph to its {\em edge expansion}.
<clarity>  This is analogous to the Cheeger-type inequality relating the spectral gap  , \lambda_2 (G), of the graph to its {\em edge expansion}.
 This is analogous to the Cheeger-type inequality relating the spectral gap , \lambda_2 , to its {\em edge expansion}.