- The Putnam Archive: https://kskedlaya.org/putnam-archive/
- Prof. Richard Borcherds has a series of great lectures on algebra and algebraic geometry available on Youtube: https://www.youtube.com/channel/UCIyDqfi_cbkp-RU20aBF-MQ/featured
- A link to my undergraduate senior thesis: https://www.math.ucdavis.edu/files/4115/5907/7549/yupeng_li.pdf
- ZAG seminars: https://www.maths.ed.ac.uk/cheltsov/zag/
- One of my favorite quote: “Physics reflects physical reality, while mathematics reflects all logically possible realities”.