Picone's Identity for p-biharmonic operator and Its Applications

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In this article we prove the nonlinear analogue of Picone's identity for p-biharmonic operator. As an application of our result we show that the Morse index of the zero solution to a p-biharmonic boundary value problem is 0. We also prove a Hardy type inequality and Sturmian comparison principle. We also show the strict monotonicity of the principle eigenvalue and linear relationship between the solutions of a system of singular p-biharmonic system.