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

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發送短信 : Properties of attractive points in cat(0) spaces