Ulysses' trip

Latest post

Oct 1, 2025, 13:55:23

I figured out a way to set up a very simple cloud save for offline #games using #Nextcloud. On #Linux, I simply replace the save data directories to be symlinks to locations synchronized with Nextcloud. On #Android, I simply add a #MacroDroid action that triggers when the game exits, where it first run a shell script using #Shizuku to copy the save files to a location where normal apps can read, and then send an intent to trigger a synchronization task of Round Sync (runs #rclone on Android).

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