  In this note we prove that: \begin{theorem} for $2\leq s<\frac{n}{2}$ or
$1\leq s<\frac{2n}{n+1}$ or $1\leq s<\frac{n}{2}$ but n is even,
$(-\Delta)^{s}(u)=|u|^{q-2}u,q=\frac{2n}{n-2s}$ has infinitely many sign
changing solutions or equivalently we can say that there exist solutions
$u_{k}$ such that $\int u_{k}(-\Delta)^{s}(u_{k})dx \to \infty$ as $k\to
\infty$ \end{theorem}
