Super Polyharmonic Property of Solutions for PDE Systems and Its Applications

Details Super Polyharmonic Property of Solutions for PDE Systems and Its Applications Super Polyharmonic Property of Solutions for PDE Systems and Its Applications

2011-10-12

arxiv.org/abs/1110.2539v1

Mathematics

Analysis of PDEs

Scientific paper

In this paper, we prove that all the positive solutions for the PDE system (-\Delta)^{k}u_{i} = f_{i}(u_{1},..., u_{m}), x \in R^{n}, i = 1, 2,..., m are super polyharmonic, i.e. (-\Delta)^{j}u_{i} > 0, j = 1, 2,..., k - 1; i = 1, 2,...,m. To prove this important super polyharmonic property, we introduced a few new ideas and derived some new estimates. As an interesting application, we establish the equivalence between the integral system u_{i}(x) = \int_{R^{n}} \frac{1}{|x - y|^{n-\alpha}}f_{i}(u_{1}(y),..., u_{m}(y))dy, x \in R^{n} and PDE system when \alpha? = 2k < n

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