發送短信 : EXPECTED SHORTFALL AS A COHERENT RISK MEASURE

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