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Polynomial solutions of quasi-homogeneous partial differential equations
Authors:Luo Xuebo  ZHENG Zhujun
Affiliation:1. Institute of Applied Mathematics, Northwestern Polytechnical University, Xi'an 710072, China;
2. Institute of Mathematics, Henan University, Kaifeng 475001, China
Abstract:By means of a method of analytic number theory the following theorem is proved. Letp be a quasi-homogeneous linear partial differential operator with degreem,m > 0, w.r.t a dilation 
$$left{ {delta _tau  } right}{text{ }}_{tau<  0} $$
given by ( a1, …, an). Assume that either a1, …, an are positive rational numbers or 
$$m{text{  =  }}sumlimits_{j = 1}^n {alpha _j alpha _j } $$
for some 
$$alpha {text{  =  }}left( {alpha _1 ,{text{ }} ldots {text{ }},alpha _n } right) in l _ + ^n $$
Then the dimension of the space of polynomial solutions of the equationp[u] = 0 on ℝn must be infinite
Keywords:quasi-homogeneous partial differential operator  polynomial solution, dimension of the space of solution  method of analytic number theory
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