On the index of the global attractor for a class of -Laplacian equations

By means of the Z(2) index, we study the geometrical property of the global attractor for a class of symmetric p-Laplacian equations u(t) - div(vertical bar del u vertical bar(p-2)del u) + vertical bar u vertical bar(r-2)u - lambda vertical bar u vertical bar(s-2)u + f(x.u) = 0, where lambda > 0, 2