Ka duba nassin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar nassin: Passage: Har ila yau, a karo na farko, an bincika iyakokin ilimin lissafi. Niels Henrik Abel, ɗan ƙasar Norway, da Évariste Galois, ɗan Faransa, sun tabbatar da cewa babu wata hanyar algebraic ta gaba ɗaya don warware daidaitattun polynomial na digiri mafi girma fiye da huɗu (Abel<unk>Ruffini theorem). Sauran masana lissafi na ƙarni na 19 sun yi amfani da wannan a cikin hujjojin da suka nuna cewa madaidaiciya da kamfas kadai ba su isa ba don yanke kusurwa ta hanyar son rai, don gina gefen cube sau biyu girman da aka bayar na cube, ko don gina murabba'i mai girma daidai da yankin da aka bayar da da da'irar. Masana lissafi sun yi ƙoƙari su warware duk waɗannan matsalolin tun zamanin tsoffin Helenawa. A gefe guda, an wuce iyakancewar lambobi uku a cikin lissafi a cikin karni na 19 ta hanyar la'akari da sararin sararin samaniya da yanayin sararin samaniya.
Yaren mutanen Norway