發送短信

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

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發送短信 : Linear Operators that Preserve the Edgesum of a Graph