These are great. I wonder why he didn't just handwrite the notes. These are much better, but they seem like they would take a long time unless you can type latex quickly.
Thanks, I'm doing a Masters now and I was planning on taking Number Theory and Abstract Algebra next term. I took mathematical cryptography this term and it got me interested in more related math.
A negative article "How Not to Be Successful" would be interesting, with unobvious observations. It could also include the top reasons why people get rejected from YC.