Ulysses’ trip

Latest post

Nov 9, 2026, 10:44:21

Last Friday, my #GitHub Education Pack benefits expired, and then all my workflows stopped working. I immediately filed a new application, but the Education Pack would only become effective 3 days after the application was approven. Ah, I really need to have #selfhost-ed runners should I have a decent enough spare machine at home.

Articles

Feb 21, 2024
Letting people know when you are asleep
While I am asleep, the sleeping state is indicated on my Discord and GitHub user status. I achieve this by using MacroDroid.
/guide #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.
/guide #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.
/physics #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?
/update #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 $\varphi(m)\le2$ .
/math #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.
/update #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!
/programming #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.
/physics #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.
/guide #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.
/misc #linux #selfhosting