發送短信 : Hyperbolic cross approximation in infinite dimensions

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