The harmonic series is a divergent series in the form It is often useful to use in comparison tests, since similar series appear fairly often. A related series is the alternating harmonic series, which takes the form Unlike the harmonic series, the alternating harmonic series is convergent and converges to . File:Integral apl obsah2.svg This calculus-related article contains minimal information concerning its topic. You can help the Mathematics Wikia by adding to it.