[anon_tor_12345]

arnold's proof is the most intuitive and what made it click after years of being responsible for understanding it (several years of algebra at the undergrad and grad level):

https://www.youtube.com/watch?v=zeRXVL6qPk4

[mjreacher]

Is there any difference between that video and this one?: https://www.youtube.com/watch?v=RhpVSV6iCko seems to be the same author but that video is 10 minutes longer.

[anon_tor_12345]

there is some slight difference but i don't remember what it is. i wrote a blog post about abel-ruffini based on those two videos and i remember there being some things that were clearer in one rather than the other (but i don't remember which!)