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

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