Ratio test
Criterion for the convergence of a series / From Wikipedia, the free encyclopedia
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In mathematics, the ratio test is a test (or "criterion") for the convergence of a series
where each term is a real or complex number and an is nonzero when n is large. The test was first published by Jean le Rond d'Alembert and is sometimes known as d'Alembert's ratio test or as the Cauchy ratio test.[1]