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May  2018, 17(3): 807-821. doi: 10.3934/cpaa.2018041

## Symmetry and non-existence of solutions to an integral system

 School of Mathematical Sciences, Shanghai Jiao Tong University, Shanghai, 200240, China

* Corresponding author

Received  June 2017 Revised  June 2017 Published  January 2018

In this paper, we consider the nonnegative solutions of the following system of integral form:
 $\left\{ \begin{matrix} {{u}_{i}}(x)=\int_{{{\mathbf{R}}^{n}}}{\frac{1}{|x-y{{|}^{n-\alpha }}}}{{f}_{i}}(u(y))dy,\ \ x\in {{\mathbf{R}}^{n}},\ \ i=1,\cdots ,m, \\ 0<\alpha Here $ f_i(u)∈ C^1(\mathbf{R^m_+})\bigcap$$ C^0(\mathbf{\overline{R^m_+}})(i = 1,2,···,m)$are real-valued functions, nonnegative, homogeneous of degree $ β_{i}$, where $ 0<β_{i} ≤q \frac{n+α}{n-α}$, and monotone nondecreasing with respect to the variables $ u_1, u_2, ···, u_m$. We show that the nonnegative solution $ u = (u_1,u_2,···,u_m)$is radially symmetric in the critical and subcritical case by method of moving planes in an integral form and $ u$must be zero in the subcritical case. Futhermore, we consider the form of $ f_i(u) = \sum_{r = 1}^{k}f_{ir}(u),$where $ f_{ir}(u)$are real-valued homogeneous functions of various degrees $ β_{ir}, r = 1,2,···,k$and $ 0 <β_{ir} ≤q \frac{n+α}{n-α}$. We also show that the radial symmetry property of the nonnegative solution. Due to the homogeneous of degree can be different, the more intricate method is needed to deal with this difficulty. Citation: Yingshu Lü. Symmetry and non-existence of solutions to an integral system. Communications on Pure and Applied Analysis, 2018, 17 (3) : 807-821. doi: 10.3934/cpaa.2018041 ##### References:   B. Gidas, W. Ni and L. Nirenberg, Symmetry of positive soltions of nonlinear elliptic equaions in$ {\mathbf{R}}^n$, Mathematical Analysis And Applications, Part A, pp. 369-402, Adv. in Math. Suppl. Stud., 7a, Academic Press, New York-London, 1981.  L. Caffarelli, B. Gidas and J. Spruck, Asymptotic symmetry and local behavior of semilinear elliptic equations with critical Sobolev growth, Comm. Pure Appl. Math., 42 (1989), 271-297.  A. Chang and P. Yang, On uniqueness of solutions of n-th order differential equation in conformal geometry, Math. Res. Letters, 4 (1997), 1-12.  W. Chen and C. Li, Classification of positive solutions for nonlinear differential and integral systems with critial exponents, Acta Math Sci., 29 (2009), 949-960.  W. Chen, C. Li and B. Ou, Classification of solutions for an integral equation, Comm. Pure Appl. Math., 59 (2006), 330-343.  W. Chen, C. Li and B. Ou, Classification of solutions for a system of integral equations, Comm. Partial Differential Equations, 30 (2005), 59-65.  W. Chen, C. Li and B. Ou, Qualitative properties of solutions for an integral equation, Discrete Contin. Dyn. Syst., 12 (2005), 347-354.  W. Chen and C. Li, Classification of solutions of some nonlinear elliptic equations, Duke Math. J., 63 (1991), 615-622.  W. Chen and C. Li, A priori estimates for prescribing scalar curvature equations, Ann. of Math., 145 (1997), 547-564.  Y. Fang and W. Chen, A Liouville type theorem for poly-harmonic Dirichlet problems in a half space, Adv. Math., 229 (2012), 2835-2867.  C. Jin and C. Li, Symmetry of solutions to some integral equations, Proc. Amer. Math. Soc., 134 (2006), 1661-1670.  J. Serrin, A Symmetry problem in potential theory, Arch. Rational Mech. Anal., 43 (1971), 304-318.  C. Li, Local asymptotic symmetry of singular solutions to nonlinear elliptic equations, Invent. Math., 123 (1996), 221-231.  C. Li and L. Ma, Uniqueness of positive bound states to Shrodinger systems with critical exponents, SIAM J. Math. Anal., 40 (2007), 1049-1057.  R. Zhuo, W. Chen, X. Cui and Z. Yuan, Symmetry and non-existence of solutions for a nonlinear system involving the fractional laplacian, Discrete Contin. Dyn. Syst., 36 (2016), 1125-1141.  show all references ##### References:   B. Gidas, W. Ni and L. Nirenberg, Symmetry of positive soltions of nonlinear elliptic equaions in$ {\mathbf{R}}^n$, Mathematical Analysis And Applications, Part A, pp. 369-402, Adv. in Math. Suppl. Stud., 7a, Academic Press, New York-London, 1981.  L. Caffarelli, B. Gidas and J. Spruck, Asymptotic symmetry and local behavior of semilinear elliptic equations with critical Sobolev growth, Comm. Pure Appl. Math., 42 (1989), 271-297.  A. Chang and P. Yang, On uniqueness of solutions of n-th order differential equation in conformal geometry, Math. Res. Letters, 4 (1997), 1-12.  W. Chen and C. Li, Classification of positive solutions for nonlinear differential and integral systems with critial exponents, Acta Math Sci., 29 (2009), 949-960.  W. Chen, C. Li and B. Ou, Classification of solutions for an integral equation, Comm. Pure Appl. Math., 59 (2006), 330-343.  W. Chen, C. Li and B. Ou, Classification of solutions for a system of integral equations, Comm. Partial Differential Equations, 30 (2005), 59-65.  W. Chen, C. Li and B. Ou, Qualitative properties of solutions for an integral equation, Discrete Contin. Dyn. Syst., 12 (2005), 347-354.  W. Chen and C. Li, Classification of solutions of some nonlinear elliptic equations, Duke Math. J., 63 (1991), 615-622.  W. Chen and C. Li, A priori estimates for prescribing scalar curvature equations, Ann. of Math., 145 (1997), 547-564.  Y. Fang and W. Chen, A Liouville type theorem for poly-harmonic Dirichlet problems in a half space, Adv. Math., 229 (2012), 2835-2867.  C. Jin and C. Li, Symmetry of solutions to some integral equations, Proc. Amer. Math. Soc., 134 (2006), 1661-1670.  J. Serrin, A Symmetry problem in potential theory, Arch. Rational Mech. Anal., 43 (1971), 304-318.  C. Li, Local asymptotic symmetry of singular solutions to nonlinear elliptic equations, Invent. Math., 123 (1996), 221-231.  C. Li and L. Ma, Uniqueness of positive bound states to Shrodinger systems with critical exponents, SIAM J. Math. Anal., 40 (2007), 1049-1057.  R. Zhuo, W. Chen, X. Cui and Z. Yuan, Symmetry and non-existence of solutions for a nonlinear system involving the fractional laplacian, Discrete Contin. Dyn. Syst., 36 (2016), 1125-1141.  Zhenjie Li, Chunqin Zhou. 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