Where the nth term is said to be the general term of the series, moreover, the nth partical sum of the series is given by .

 
  • 定義如果級數的部分和數列有極限,即,則稱(chēng)無(wú)窮級數收斂,這時(shí)極限叫做這級數的和,并寫(xiě)成;如果沒(méi)有極限,則稱(chēng)無(wú)窮級數發(fā)散。
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