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 __   __    _____    ______    __   __     _____  
 \ \\/ //  |  ___|| |      \\  \ \\/ //   / ___// 
  \   //   | ||__   |  --  //   \ ` //    \___ \\ 
  / . \\   | ||__   |  --  \\    | ||     /    // 
 /_//\_\\  |_____|| |______//    |_||    /____//  
 `-`  --`  `-----`  `------`     `-`'   `-----`

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發送短信 : The Kreiss matrix theorem on a general complex domain