Dǎɣ 1830, Évariste Galois asikna as iyadak dǎɣ alɣisaban ən degré ogaran ikoz waradoben adiqil ayknan fal radiəautan, əd isikna as hak alɣisab, nadobat ananu as taqal aylayaman fal radikotan, əd, afal taqal, ye kanan.