<正>This note looks at the two similarity solutions of the Navier-Stokes equations in polar coordinates. In the second solution an initial value problem is redu
<正> In this paper,based on the forms and structures of Wronskian solutions to soliton equations,a Wronskianform expansion method is presented to find a new cla
<正> Community structure is an important characteristic in real complex network.It is a network consists ofgroups of nodes within which links are dense but amon