發送短信

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

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