發送短信 : Singular differential equations with (n,p) boundary conditions

   _____    _____               ______    ______  
  / ___//  |  ___||     ___    /_   _//  /_   _// 
  \___ \\  | ||__      /   ||   -| ||-   `-| |,-  
  /    //  | ||__     | [] ||   _| ||_     | ||   
 /____//   |_____||    \__ ||  /_____//    |_||   
`-----`    `-----`      -|_||  `-----`     `-`'   
                         `-`