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| \  / ||  /_   _//     ___     / _ \\  \ \\ / // 
|  \/  ||   -| ||-     /   ||  / //\ \\  \ \/ //  
| .  . ||   _| ||_    | [] || |  ___  ||  \  //   
|_|\/|_||  /_____//    \__ || |_||  |_||   \//    
`-`  `-`   `-----`      -|_|| `-`   `-`     `     
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發送短信 : On Metric Structures of Normed Gyrogroups