發送短信 : On the martingale representation theorem and approximate hedging a contingent claim in the minimum mean square deviation criterion

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