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

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發送短信 : Spectral properties of transfer operators