أرسل هذا في رسالة قصيرة: The nonlinear product of the bessel diamond operator and the bessel klein-gordon operator related to the bessel biharmonic equation

  _____      ___     _____       ___     _    _   
 |__  //    / _ \\  |  __ \\    / _ \\  | \  / || 
   / //    / //\ \\ | |  \ ||  / //\ \\ |  \/  || 
  / //__  |  ___  ||| |__/ || |  ___  ||| .  . || 
 /_____|| |_||  |_|||_____//  |_||  |_|||_|\/|_|| 
 `-----`  `-`   `-`  -----`   `-`   `-` `-`  `-`