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

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