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  ____       ___      ____     _    _    ______   
 |  _ \\    / _ \\   |  _ \\  | || | || |      \\ 
 | |_| ||  / //\ \\  | |_| || | || | || |  --  // 
 | .  //  |  ___  || | .  //  | \\_/ || |  --  \\ 
 |_|\_\\  |_||  |_|| |_|\_\\   \____//  |______// 
 `-` --`  `-`   `-`  `-` --`    `---`   `------`

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發送短信 : Non-abelian representations of some sporadic geometries