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

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發送短信 : Interior fixed points of unit-sphere-preserving Euclidean maps