Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: A spherical surface kamar cewa na Duniya na samar da mai sauki misali. Za'a iya bayyana wurin kowane ma'ana a kan farfajiyar ta hanyar haɗin gwiwar biyu: latitude da longitude. Ba kamar haɗin Cartesian na jirgin sama ba, bambancin haɗin kai ba daidai yake da nisa a farfajiyar ba, kamar yadda aka nuna a cikin zane a hannun dama: ga wani a kan ma'auni, yana motsawa 30 digiri na tsawon yamma (magenta line) daidai da nisa na kimanin kilomita 3,300 (2,100 mi), yayin da wani a wani latitude na digiri 55, yana motsawa 30 digiri na tsawon yamma (launi mai launin shuɗi) yana rufe nesa na kawai kilomita 1,900 (1,200 mi). Saboda haka haɗin kai ba ya ba da isasshen bayani don bayyana geometry na wani yanki, ko kuma ainihin geometry na kowane sararin samaniya ko sararin samaniya. Wannan bayanin shine ainihin abin da aka sanya a cikin ma'auni, wanda shine aikin da aka ƙayyade a kowane wuri na farfajiyar (ko sararin samaniya, ko sararin samaniya) kuma yana danganta bambancin haɗin kai zuwa bambancin nesa. Duk sauran adadi da suke da sha'awa a cikin lissafi, kamar tsawon kowane lanƙwasa, ko kusurwar da lanƙwasa biyu suka haɗu, ana iya lissafa su daga wannan aikin awo. Ana iya amfani da aikin awo da ƙimar canjin sa daga aya zuwa aya don ayyana girman lissafi da ake kira Riemann curvature tensor, wanda ke bayyana daidai yadda sararin samaniya ko sararin samaniya ya lanƙwasa a kowane aya. A cikin ka'idar dangi gabaɗaya, ma'auni da Riemann curvature tensor sune adadi da aka ayyana a kowane lokaci a cikin sararin samaniya. Kamar yadda aka riga aka ambata, abun da ke ciki na sararin samaniya yana ƙayyade wani adadi, makamashi<unk>momentum tensor T, da kuma ka'idar cewa "sararin samaniya ya gaya wa abu yadda za a motsa, kuma abu ya gaya wa sararin samaniya yadda za a lanƙwasa" yana nufin cewa waɗannan adadi dole ne su danganta da juna. Einstein ya tsara wannan dangantaka ta amfani da Riemann curvature tensor da kuma ma'auni don ayyana wani nau'i mai yawa G, wanda ake kira Einstein tensor, wanda ya bayyana wasu fannoni na hanyar da sararin samaniya ya karkata....  Tambaya: Wace irin farfajiyar ce ba za a iya kwatanta ta ta yin amfani da ma'auni ba?
ƙwallon ƙafa