發送短信

數:

提供者:

CAPTCHA:

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

Please enter what you see:

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