發送短信 : Fixed point theorems for nonlinear mappings and strict convexity of banach spaces

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