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  • 1 Department of Applied Mathematics, Hunan Institute of Science and Technology Yueyang 414000, Hunan, P.R. China Yueyang 414000, Hunan, P.R. China
  • 2 Department of Applied Mathematics, Nanjing University of Science and Technology Nanjing 210094, P.R. China Nanjing 210094, P.R. China
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For a vector system in En, we establish a class of inequalities for k-dimensional space angle (defined in this paper), and give some application thereof.