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

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發送短信 : Some remarks and examples on domain of sums of series in banach spaces