發送短信

數:

提供者:

CAPTCHA:

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

Please enter what you see:

發送短信 : Simple proof of the detectability lemma and spectral gap amplification