An tabbatar da cewa (C, n) tarawa da (H, n) tarawa koyaushe suna ba da sakamako iri ɗaya, amma suna da bambance-bambancen tarihi. A cikin 1887, Cesàro ya kusanci bayyana ma'anar (C, n) tarawa, amma ya ba da wasu 'yan misalai kawai. Musamman, ya tara 1 − 2 + 3 − 4 +..., zuwa 1⁄4 ta hanyar hanyar da za a iya sake fasalta shi a matsayin (C, n) amma ba a ba da hujja a matsayin irin wannan a lokacin ba. Ya bayyana a hukumance hanyoyin (C, n) a cikin 1890 don bayyana ka'idar Cauchy cewa jerin (C, n) -summable da (C, m-summable) jerin (C, m + m) jerin (C, n + m 1) koyaushe suna ba da sakamako iri ɗaya. Tambaya: (H, n) Tambaya: Menene samfurin da ya ba da?
(C, n)