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

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發送短信 : A simple proof of the brouwer fixed point theorem