Theory, examples and challenging problems organized by topics, which would be useful for preparation to Physics competitions and advanced exams

This section contains lecture video excerpts and lecture notes on polar coordinates, and a recitation video on converting from polar to rectangular coordinates.

What are the best Go books this year? Read my (relatively) unbiased recommendations for the Go books you should absolutely buy and read right now, whether you’re a beginner or expert Gopher.

These notes aim to provide an introduction to the basics of black hole thermodynamics. After explaining Bekenstein's original proposal that black holes have entropy, we discuss Hawking's discovery...