Yijia’s Blog

The first principle is that you must not fool yourself and you are the person who is easiest to fool. — Richard Feynman

Welcome

Welcome to my blog, where I share my thoughts and insights on physics, mathematics, and philosophy.

Personal Reflections

Open-ended explorations of questions that arise during my studies — sometimes with answers, sometimes without.

Projects & Resources

Code and project releases from my own work or collaborations.

Feel free to reach out — link exchanges welcome!

Recent Posts

Tao’s Analysis I, Chapter 4: Integers and rationals

I want to strike a better balance with this blog going forward — not just a raw log of my own reading reflections, but also weaving in summary overviews or proofs that I…

Tao’s Analysis I, Chapter 3: Set Theory

Just like with the previous chapter, I came into this with almost zero background in set theory. I spent 1,100 minutes over four days getting through this chapter and made a…

Tao’s Analysis I, Chapter 2: Natural Numbers

I began with the Chinese version (my native language), but I wasted time because of a translation error in Chapter 2. I was afraid there would be more mistakes in the other…

Building process of this blog

This blog is built by Quarto, which is a powerful open-source scientific and technical publishing system built on Pandoc (written by AI in vscode).

Test post: Euler-Lagrange’s equation in simple pendulum

Classic Mechanics

Here is the Euler-Lagrange’s equation:

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