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

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