أرسل هذا في رسالة قصيرة: The compound equation related to the Bessel-Helmholtz equation and the Bessel-Klein-Gordon equation

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