I'm Korean high school student who wants to study how to prove that degree ≥5 polynomial equations are not solvable. I know some of Set Theory and will study abstract algebra with 'A First Course in Abstract Algebra - Fraleigh'.
But I have a little time because I have to study hard other subjects to entrance into a good university. So, I want to study some part of Fraleigh.
Please let me know what sections are necessary to study that theorem. Thanks in advance.