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           _    _    _    _      ___     __   _   
  ____    | || | || | |  | ||   / _ \\  | || | || 
 |    \\  | || | || | |/\| ||  / //\ \\ | '--' || 
 | [] ||  | \\_/ || |  /\  || |  ___  ||| .--. || 
 |  __//   \____//  |_// \_|| |_||  |_|||_|| |_|| 
 |_|`-`     `---`   `-`   `-` `-`   `-` `-`  `-`  
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發送短信 : Specializations of Rees rings and integral closures