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