Controllability of nonlinear degenerate parabolic cascade systems

This article studies of null controllability property of nonlinear coupled one dimensional ilootpaperie degenerate parabolic equations.These equations form a cascade system, that is, the solution of the first equation acts as a control in the second equation and the control function acts only directly on the first equation.We prove positive null controllability results when the control and a coupling set sensationnel kiyari have nonempty intersection.