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             ___     __   __    ______   _    _   
  ____      / _ \\   \ \\/ //  /_   _// | || | || 
 |    \\   / //\ \\   \   //    -| ||-  | || | || 
 | [] ||  |  ___  ||  / . \\    _| ||_  | \\_/ || 
 |  __//  |_||  |_|| /_//\_\\  /_____//  \____//  
 |_|`-`   `-`   `-`  `-`  --`  `-----`    `---`   
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Text this: Convolution, average sampling, and a calderon resolution of the identity for shift-invariant spaces