發送短信 : Nonlinear Urysohn discrete equations on the infinite interval: A fixed-point approach

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