發送短信 : An Equivalent Definition for the Backwards Ito Integral

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