أرسل هذا في رسالة قصيرة: Distribution solutions of some PDEs related to the wave equation and the diamond operator

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