(参考) https://arxiv.org/abs/1804.04657 Mathematics > Group Theory [Submitted on 12 Apr 2018] Galois Theory - a first course Brent Everitt These notes are a self-contained introduction to Galois theory, designed for the student who has done a first course in abstract algebra. https://arxiv.org/pdf/1804.04657
P3 （余談だが、この図が綺麗だ） Fig.-1.1.TheCayleygraphfor thesmallestnon-Abeliansimplegroup, thealternatinggroupA5,withrespect to σ=(1,2,3,4,5)–theblueedges–andτ=(1,2)(3,4)–theblackedges.
P7 Fig.0.2.The solutions in C to the equation x5−2=0. (この図のすぐ下に この方程式の図があるよ、説明つきでね。なお P77でも 再度同じ図の説明が出てくる)
