High Quality Content by WIKIPEDIA articles! The infinite series 1 ? 1 + 1 ? 1 + … is sometimes called Grandi's series, after Italian mathematician, philosopher, and priest Guido Grandi, who gave a memorable treatment of the series in 1703. It is a divergent series, meaning that it lacks a sum in the usual sense. On the other hand, its Cesaro sum is 1/2 .

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