Free Course Recommendations, from Alston Mabry
There are 400 free Ivy League university courses you can take online in 2019
I sometimes explore online courses looking for interesting lecture videos that I can either watch or convert to mp3s and use as podcasts.
Mr. Isomorphisms writes:
Their list doesn’t have a couple of my favorites, including Aiken’s compilers course at Stanford and MIT’s xv6 lions commentary on unix.
Recent mathematical finds:
-A locus with 25920 linear transformations by H F Baker (archive.org)
-Ikosahedron by Felix Klein (archive.org)
-Slodowy: platonic solids, kleinian singularities, and lie groups
-Elie Cartan: theory of spinors (more readable than you might think; written in the autumn of his life)
-Park & Yang: Yang-Baxter equations (on arXiv, written for an encyclopedia)
The A-D-E stuff is probably the most interesting mathematics ever found. (Mathematicians get to leverage the enormous and relatively obvious differences between platonic solids to make inferences about other structures.)