發送短信

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           _    _              _    _   __    __  
  ____    | || | ||   ____    | || | || \ \\ / // 
 |    \\  | || | ||  |    \\  | || | ||  \ \/ //  
 | [] ||  | \\_/ ||  | [] ||  | \\_/ ||   \  //   
 |  __//   \____//   |  __//   \____//     \//    
 |_|`-`     `---`    |_|`-`     `---`       `     
 `-`                 `-`

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發送短信 : A Simpler Proof for the ϵ-δ Characterization of Baire Class One Functions