Ulysses' trip

Latest post

Oct 15, 2025, 00:53:30

Nice, another #Wacom pen broke... It is simply unbelievable how unreliable those things are, and I do not understand why they are designed to be so hard to disassemble.

Articles

Feb 21, 2024
Letting people know when you are asleep

While you are asleep, indicate that on your Discord and GitHub user status.
- Categories: guide
- Tags: android, github
Jan 8, 2024
Using nmcli to connect to eduroam in UCSB

Use nmcli to connect to eduroam in UCSB without using the configuration assistant tool provided by eduroam.
- Categories: guide
- Tags: linux, school
Dec 22, 2023
The duality between two plane trajectories related by a conformal map

The conformal map $\fc wz$ transforms the trajectory with energy $-B$ in potential $\fc Uz\ceq A\v{\d w/\d z}^2$ into the trajectory with energy $-A$ in potential $\fc Vw\ceq B\v{\d z/\d w}^2$ . I will prove this beautiful result and show some implications of it.
- Categories: physics
- Tags: complex, classical mechanics, canonical transformation, kepler problem, mathematical physics, vector analysis, long paper
Nov 19, 2023
Embed the latest Mastodon post in my website

I show the latest Mastodon post in my website hosted on GitHub Pages, and it does not require JavaScript on the client side. How do I do that?
- Categories: update
- Tags: web, jekyll, selfhosting
Nov 9, 2023
Rotational symmetry of plane lattices as a simple example of algebraic number theory

For a plane lattice, there is only a finite number of different rotational symmetries that are compatible with the discrete translational symmetry. For example, the 5-fold rotational symmetry is not one of them. Why is that? It turns out that whether an $m$ -fold symmetry is compatible with translational symmetry is the same as whether $\varphi(m)\le2$ .
- Categories: math
- Tags: complex, condensed matter physics, algebraic number theory, lattice, mathematical physics
Nov 6, 2023
I restructured my blog

If you have not noticed, the equations on my blog are now rendered server-side. This change makes it possible for those who turn off JavaScript on their browsers to see the equations. I also updated the theme from Minima v2 to Minima v3.
- Categories: update
- Tags: jekyll, tex, update, web
Oct 31, 2023
An 🎃 easy 👻 but 🍬 spooky 💀 Ruby challenge

“It’s the weekend and you’ve just completed a seance with friends. After communing with the dead, you realize a mysterious message was left behind.” What is the decoded message? Use your Ruby skills to find out!
- Categories: programming
- Tags: ruby, code golf, fooling around
Oct 18, 2023
You can replace $\mathrm i$ with $-\mathrm i$ in the Schrödinger equation?

When someone asks you why it is $-\mathrm i$ here instead of $\mathrm i$ or the other way around, you can say that this is just a convention. My professor of quantum mechanics once asked the class similar a question, and I replied with this letter.
- Categories: physics
- Tags: quantum mechanics, letter, complex
Sep 29, 2023
How to self-host Overleaf (ShareLaTeX)

It has been a pain setting up Overleaf on my own server. I have finally figured it out and I am sharing my notes here.
- Categories: guide
- Tags: linux, selfhosting, tex
Sep 17, 2023
My old computers and my experience of daily driving Linux and self-hosting

I have been using Linux and self-hosting for over a year now. Overall, I would like to say that it is rather satisfactory and that I will continue to use Linux as my daily driver in future. Thinking of that, I felt a little bit nostalgic about my old computers. So I decided to write an article about my old computers and my experience of daily driving Linux now.
- Categories: misc
- Tags: linux, selfhosting