Duba zuwa sashi na ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda sashi: Passage: Wannan sakamakon yana haɓaka jimlar Abel, wanda aka dawo da shi ta hanyar barin φ ((x) = exp ((−x). Ana iya tabbatar da bayanin gaba ɗaya ta hanyar haɗuwa da sharuɗɗa a cikin jerin kan m da kuma canza kalmar a cikin Riemann integral. Don mataki na ƙarshe, hujja mai dacewa don 1 − 1 + 1 − 1 +... ya shafi ka'idar darajar matsakaici, amma a nan mutum yana buƙatar nau'in Lagrange mai ƙarfi na ka'idar Taylor. Tambaya: Ta yaya aka dawo da jimlar Abel?
ta hanyar barin φ(x) = exp(−x)