Optics and the Principle of Least Time

(This is a writeup of Exercise 1.3 [https://tgvaughan.github.io/sicm/chapter001.html#Exe_1-3] from Sussman and Wisdom's "Structure and Interpretation of Classical Mechanics". See the solutions repository [https://github.com/sritchie/sicm] for more.) * Law of Reflection * Geometry * Calculus * Law of Refraction »

Half Angles from Euler's Formula

I've been reading the lovely Visual Complex Analysis [https://amzn.to/2UdJtv8] by Tristan Needham [https://www.usfca.edu/faculty/tristan-needham], and the visual-style proofs he's been throwing down have been wonderful and refreshing. I'll write more about this book and its goals later, »

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