發送短信 : Positivity and stability analysis for linear implicit difference delay equations

 ______     _____              __   __            
|      \\  |  ___||     ___    \ \\/ //     ___   
|  --  //  | ||__      /   ||   \ ` //     /   || 
|  --  \\  | ||__     | [] ||    | ||     | [] || 
|______//  |_____||    \__ ||    |_||      \__ || 
`------`   `-----`      -|_||    `-`'       -|_|| 
                         `-`                 `-`