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

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發送短信 : Fixed point property of direct sums