Kalli nassin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar nassin: Passage: Geometry mai banbanci ya zama nasa lokacin da Einstein ya yi amfani da shi a cikin ƙa'idar dangi. Sabbin fannoni na lissafi kamar ilmin lissafi, topology, da kuma ka'idar wasan John von Neumann sun canza nau'ikan tambayoyin da za a iya amsawa ta hanyoyin lissafi. Dukkanin nau'ikan tsarin an cire su ta amfani da axioms da sunaye kamar sararin samaniya, sararin samaniya da sauransu. Kamar yadda masana lissafi suke yi, an cire ma'anar tsarin da kansa kuma ya haifar da ka'idar rukuni. Grothendieck da Serre sun sake fasalin lissafin lissafi ta amfani da ka'idar sheaf. An sami babban ci gaba a cikin nazarin ingancin tsarin tsarin da Poincaré ya fara a cikin 1890s. Tambaya: Wane irin ka'idar Neumann ne ya haɓaka?
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