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

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發送短信 : Applied proof theory : proof interpretations and their use in mathematics