**Alternating series test - Wikipedia**
https://en.wikipedia.org/wiki/Alternating_series_test

OverviewFormal StatementProofExamplesSee alsoNotesExternal linksIn mathematical analysis, the alternating series test is the method used to show that an alternating series is convergent when its terms (1) decrease in absolute value, and (2) approach zero in the limit. The test was used by Gottfried Leibniz and is sometimes known as Leibniz's test, Leibniz's rule, or the Leibniz criterion. The test is only sufficient, not necessary, so some convergent alternating series may fail the first part of the test.

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