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

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發送短信 : Convolution, average sampling, and a calderon resolution of the identity for shift-invariant spaces