Riemann series theorem

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What Wikipedia says

In mathematics, the Riemann series theorem, also called the Riemann rearrangement theorem, named after 19th-century German mathematician Bernhard Riemann, says that if an infinite series of real numbers is conditionally convergent, then its terms can be arranged in a permutation so that the new series converges to an arbitrary real number, and rearranged such that the new series diverges.

Excerpt from the Wikipedia article “Riemann series theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia