Notice of RetractionThe countably many positive solutions of nonlinear singular boundary value problems with sign changing nonlinearities

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

In this paper, we study the existence of positive solutions for a class nonlinear singular boundary value systems { (φ_p1(u´))´+a₁(t)f(u, v)=0, 0<;t<;1, (φ_p2(v´))´+a₂(t)g(u, v)=0, 0<;t<;1, u(0)=u´(|1)=0, u(0)=u´(1)=0, φ_pi(s) = |s|^p_i^-2s, pi>1(i=1,2). We obtain the existence of infinitely many positive solutions by using fixed-point index theory. Especially, the nonlinear terms f; g are allowed to change sign. The conclusions in this paper essentially extend and improve the known results.