Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Ka'idar rukuni tana da manyan tushe na tarihi guda uku: ka'idar lambobi, ka'idar lissafin algebraic, da lissafi. Leonhard Euler ne ya fara jigon ka'idar lambobi, kuma ya bunkasa ta hanyar aikin Gauss akan lissafin lissafi na zamani da ƙari da ƙungiyoyi masu yawa waɗanda ke da alaƙa da filayen quadratic. Lagrange, Ruffini, da Abel sun sami sakamako na farko game da ƙungiyoyin canzawa a cikin binciken su don magance maganganun polynomial na babban digiri. Évariste Galois ya kirkiro kalmar "ƙungiya" kuma ya kafa haɗin kai, wanda yanzu aka sani da ka'idar Galois, tsakanin ka'idar rukuni da ka'idar filin. A cikin lissafi, ƙungiyoyi sun fara zama masu mahimmanci a cikin lissafin lissafi kuma, daga baya, ba Euclidean lissafi ba. Shirin Felix Klein na Erlangen ya yi shelar ka'idar rukuni don zama tsarin tsarin lissafi.  Tambaya: Wace ka'ida ce Evariste Galois ya yi?
Ka'idar Galois