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baruchel

1,541 karma · joined April 1, 2014

Teacher in Computer Science at University of Pau and the Adour Region (France)
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baruchel··on SDF Public Access Unix System ... est. 1987
I use it for several purposes : a few PHP scripts serving custom RSS files, easy temporary space for exchanging epub books between my phone and my e-reader, etc.
baruchel··on Bomb fishing is wreaking havoc on Indonesia's coral reefs
https://xkcd.com/2929/
baruchel··on A stray "j" ruined my evening
https://zippythepinhead.com/Merchant2/merchant.mv?Screen=PRO...
baruchel··on Using Thunderbird for RSS
I can confirm the TT-RSS app (found on F-Droid) is very good. I have used it for years. On the other hand, the web app is not very good, and each time I wanted to read articles on my computer from the web interface, I encountered huge issues (for some reason, the "right click / mark as read" never correctly worked on my computers, or at least with huge lags of several seconds). When my free TT-RSS provider closed, I decided to switch to FreshRSS and could compare several apps for Android; I finally set up the following workflow: free FreshRSS account + "Read You" (found on F-Droid also), and managed to achieve a very similar workflow than previously (with a much better web app).
baruchel··on Tony Hoare has died
Yes, but don't forget his formal work also (Hoare logic).
baruchel··on Self-Portrait by Ernst Mach (1886)
If I remember correctly, this picture is commented in the very good book "Exact thinking in demented times", together with Mach's ideas.
baruchel··on In Praise of APL (1977)
I’ve practiced array languages extensively myself, including for code golfing, and I fully understand the intellectual joy they can provide. But as I’ve gotten older, I’ve come to see a deep mismatch between what these languages present as “elegant” and what I find truly elegant from a computer science perspective.

Sure, realizing that the foobar of x is nothing more than the transpose of the 15th foo of x, combined via an inner product with the 7th bar of x raised to the power of baz, can be an ineffable intellectual delight. But actually computing that, rather than writing a “boring” loop, feels horrible to me. To my eyes, a “boring” piece of code written by Dijkstra in some Algol-like language contains more beauty than all these dazzling sleights of hand that hide zillions of loops under the rug while pretending that the actual computation doesn’t matter.

baruchel··on Satellites reveal heat leaking from largest US cryptocurrency mining center
When you compute some nice and elegant result, dissipated heat is an undesired side effect. But let's face it: we are speaking about proof of work. Proof of work means that a computed has run during some "required" time. In other words, you have to prove that enough heat has been dissipated. Waste of energy actually is "by design" here.
baruchel··on Ask HN: What's a book that fundamentally altered your mental models
Exact thinking in demented times by Karl Sigmund
baruchel··on Fran Sans – font inspired by San Francisco light rail displays
> Typography nerds are some of my favourite nerds.

A very detailed summary for another font (by the creator of the font), including ancient materials as well: https://mass-driver.com/article/md-nichrome-on-spacing-and-s...

baruchel··on I am stepping down as the CEO of Mastodon
I don’t want to argue about the overall trend based on a single example, but Terence Tao’s substantial use of Mastodon for communication does change the picture a bit.
baruchel··on Control structures in programming languages: from goto to algebraic effects
As some readers may not be familiar with the name Xavier Leroy, I just want to emphasize that he is one of the people behind OCaml and a leading figure promoting Rocq/Coq.
baruchel··on The shadows lurking in the equations
Shameless plug: eight years ago, I created the following website for posting plots of complex functions using similar gradients: https://kettenreihen.wordpress.com/
baruchel··on Ask HN: My family business runs on a 1993-era text-based-UI (TUI). Anybody else?
I wrote the main application for my wife's business — she's a psychologist. That was only a few years ago, but as a senior lecturer in the more theoretical parts of computer science, I never really needed fancy UIs with flashy graphical effects. So I built a core engine and used the classic dialog tool as the thin user-facing layer.

At first, my wife was pretty disappointed — as a computer science teacher, wasn't I supposed to know how to build a “real” app? But a few years later, she doesn't want anything else. I even offered to have one of my students create a nicer UI without changing the engine or database, but by now she's completely used to the terminal menus.

The tool keeps a database, collects data through dialog forms, generates PDF invoices with groff, and launches Thunderbird when needed (to send invoices, etc.).

baruchel··on John Carmack on mutable variables
Which is why functional programmers believe in the separation of Church and state. https://wiki.c2.com/?SeparationOfChurchAndState
baruchel··on Why Busy Beaver hunters fear the Antihydra
> It really is mind bending how fast this function grows.

While the BB function is obviously a well-defined function over the integers, I find it helpful to think of it as a function over qualitatively heterogeneous items—such as stones, bread toasters, mechanical watches, and computers. The key idea is to view the underlying computing devices not as “a little more powerful” than the previous ones, but as fundamentally different kinds of entities.

baruchel··on Show HN: Play abstract strategy board games online with friends or against bots
May I suggest the Greenchess website? https://greenchess.net/ It certainly has some huge potential: nice minimalist interface and probably about 50 or 60 chess variants for all tastes. Some of them are obviously more or less "recent". You can easily start a new game or accept a pending invitation. I would call the set of players quite "active" and certainly motivated. But it is true that the pool of players remains small and you generally play against the same players again and again.
baruchel··on Mathematicians discover prime number pattern in fractal chaos
Without paywall: https://www.removepaywall.com/search?url=https://www.scienti...
baruchel··on New knot theory discovery overturns long-held mathematical assumption
Without paywall: https://www.removepaywall.com/search?url=https://www.scienti...
baruchel··on Tetris Presents Math Problems Even Computers Can't Solve – Scientific American
Without paywall: https://www.removepaywall.com/search?url=https://www.scienti...
baruchel··on Landmark Langlands Proof Advances Grand Unified Theory of Math
Without paywall: https://www.removepaywall.com/search?url=https://www.scienti...
baruchel··on Science Makes the U.S. a Great Nation
Without paywall: https://www.removepaywall.com/search?url=https://www.scienti...
baruchel··on Where is my von Braun wheel?
There is a wonderful novel focusing on that point: Moonglow by Michael Chabon.
baruchel··on Manipulating trapped air bubbles in ice for message storage in cold regions
Reading the title, I immediately thought of Rabelais's "frozen words": https://www.classicalpursuits.com/where-words-unfreeze-the-t...
baruchel··on Radio Garden
Thank you for that suggestion. Great discovery!
baruchel··on New proof dramatically compresses space needed for computation
Without paywall: https://www.removepaywall.com/search?url=https://www.scienti...
baruchel··on Starship: The minimal, fast, and customizable prompt for any shell
Can't find the URL again for a funny (and probably universal) custom prompt: you had to do some

    curl <url> | sh
then you could see on your terminal thousands of various tests related to your installation, then several megabytes being downloaded with progress bars, etc.

At the very end of the whole process, the whole stuff would vanish into writing PS1="$ " at the end of your ~/.bashrc

Of course, the very same prompt was used whatever your install could be. I think it was some joke making fun of all these crazy and heavy custom prompts all around.

baruchel··on Magnus Carlsen might walk away from classical chess
Just my two cents: a very interesting website for playing chess variants — https://greenchess.net/ . It has a simple, efficient, and uncluttered interface with no ads and many variants available. Unfortunately, the number of active players is a bit low.
baruchel··on The Art of Fugue – Contrapunctus I (2021)
So you want to write a fugue? https://m.youtube.com/watch?v=8sogUjiqg2c
baruchel··on Dimension 126 Contains Twisted Shapes, Mathematicians Prove
I have always been fond of the following quote by Jacobi: “Mathematics exists solely for the honor of the human mind”
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