Grandi's Series
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High Quality Content by WIKIPEDIA articles! In modern mathematics, the sum of an infinite series is defined to be the limit of the sequence of its partial sums, if it exists. The sequence of partial sums of Grandi's series is 1, 0, 1, 0, , which clearly does not approach any number (although it does have two accumulation points at 0 and 1). Therefore, Grandi's series is divergent. It can be shown that it is not valid to perform many seemingly innocuous operations on a series, such as reordering individual terms, unless the series is absolutely convergent. Otherwise these operations can alter…mehr

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High Quality Content by WIKIPEDIA articles! In modern mathematics, the sum of an infinite series is defined to be the limit of the sequence of its partial sums, if it exists. The sequence of partial sums of Grandi's series is 1, 0, 1, 0, , which clearly does not approach any number (although it does have two accumulation points at 0 and 1). Therefore, Grandi's series is divergent. It can be shown that it is not valid to perform many seemingly innocuous operations on a series, such as reordering individual terms, unless the series is absolutely convergent. Otherwise these operations can alter the result of summation. It's easy to see how terms of Grandi's series can be rearranged to arrive at any integer number, not only 0 or 1.