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

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發送短信 : A note on properties that imply the fixed point property