發送短信 : On the delta hedging related to the eigenvalues and the interest rate of the black-scholes equation

             ___     __   __     ___      _  __  
  ____      / _ \\   \ \\/ //   / _ \\   | |/ // 
 |    \\   | / \ ||   \   //   | / \ ||  | ' //  
 | [] ||   | \_/ ||   / . \\   | \_/ ||  | . \\  
 |  __//    \___//   /_//\_\\   \___//   |_|\_\\ 
 |_|`-`     `---`    `-`  --`   `---`    `-` --` 
 `-`