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

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發送短信 : The fixed point property of a non-unital abelian banach algebra generated by an element with infinite spectrum