發送短信 : On the linear radical of lattices

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