發送短信 : Index coding with side information via penalty method in rank minimisation

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