SciClicEnglish on YouTube has a great intro series on General Relativity mathematics, and EigenChris has a relativity playlist that goes deeper into the mathematics for a full explanation. I took a grad course on Differential Geometry and came away with a better understanding of the Christoffel...
I recently read some of his papers. I started with some works around 1905. It was interesting to see the development (and simplification) of his ideas from when he first introduced special relativity and explained the ultraviolet catastrophe (photons as discrete wave packets / energy quanta)...
I am a math PhD working in software/technology who is a physics hobbyist. I’ve gone through MIT 8.01 - 8.05 courses and watched and worked through a number of additional videos and problems. My interest is mostly getting exposure to more ideas through the community. I don’t plan on trying to...