### Galois Theory

#### Posted by Tom Leinster

I’ve just arXived my notes for Edinburgh’s undergraduate Galois theory course, which I taught from 2021 to 2023.

I first shared the notes on my website some time ago. But it took me a while to arXiv them, because I wanted to simultaneously make public most of the other course materials. I now have, which means the following are now available to all:

Notes forming a complete, self-contained account of the part of Galois theory that we covered.

About 40 short explanatory videos.

A large collection of problems.

Nearly 500 multiple choice questions.

I’m a little bemused by the popularity of the Galois theory notes. I’ve made quite a few sets of course notes public before, e.g.:

But the Galois theory notes seem to have caught on in a way that none of the others have (except category theory — but that one, I made into a book).

It’s true that I probably took a bit of extra care on them: I first taught
the course during full Covid lockdown, and I felt the students would
need more guidance than usual, given that they were deprived of all
opportunities for face-to-face interaction. But I wonder whether the real
reason is that the Galois theory notes simply *look* nicer, with colour and
little icons and so on.

In any case, I hope the notes, videos and questions bring people joy.

## Re: Galois Theory

thank you for sharing these publicly!