發送短信 : Distribution solutions of some PDEs related to the wave equation and the diamond operator

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