Safe travels, everyone

Like, 4GB?

@JacquesC2 I believe you mentioned to me back in Bonn that you have/know a paper about comparing benchmark results against historic data for significance detection, could you remind me which one it was?

I'm at Frankfurt Airport and the two things I spotted on the airport TV before I thought of better things to do again were * a big football stadium banner "DIE FANS" * a supercut of the 7:1 GER:BRA game Someone is *not* optimizing this stream for international audiences!

i hope this email finds you well

After nine months of design, implementation, and orchestration, Lean's new module system I have been working on is now live in 4.26.0-rc1 and adopted throughout Mathlib. By introducing a system for checked and enforced API boundaries between files, it allows […] [Original post on functional.cafe]

wavy

Mengen, Leere

@fmontesi will be the first director of the new Centre for Formal Methods and Future Computing (FORM)! Among other things, the Centre will work on the development of Lean's CS Library, where Fabrizio already serves as a member of the steering committee. Interested in research in formal […]

Going to the museum to critique the artist's code

Gonna store all my jewelry in Hilbert's Hotel going forward

Easy reproducer

Ist Ladesäule eigentlich der schwäbische Diminutiv von Ladesau

Anything can look serene if you crop out all the people around it

Another new Map Men already? We are truly blessed

For a second I was convinced Mathlib had a file named VerySmallDog.lean

Wispy

For my new job, I am looking for a flat in Munich from January or February, 2026. Please let me know if you or someone you know is looking for a new tenant. Retoot much appreciated! Here are the rough parameters I am looking for in a flat: Rent (warm) […] [Original post on social.tr0llhoehle.de]

Okay this is just too fun using `jj`: over the week I've accumulated a good amount of random fixes and improvements on a prototyping branch (pic 1). Using `jj parallelize 'ancestors(@, 5)'`, I can make them independent while keeping the ultimate contents of […] [Original post on functional.cafe]

Wait why does one out of four British Airways flights have classical music during boarding? What are they plotting?

Despite the odds, I have made it to Glasgow and will be talking about macro crimes and other fun stuff together with @nomeata at the VeTSS summer school tomorrow!

New fear unlocked: getting your laptop splashed on while on the plane by the inexpert opening of a water bottle nearby. I think it'll be okay but jeeze!

Indeed, I now have to listen to stupid ads in between In Our Time episodes again! https://www.theguardian.com/media/2025/aug/10/blocking-access-to-bbc-sounds-for-listeners-outside-the-uk-is-a-disaster

"You don't need a .pkpass, just use our app!" The app:

Nice https://tenpages.github.io/us-level/eu.html

I am happy to announce that the person in my immediate vicinity who brought a laptop to the swimming pool for work on a Sunday is *not* me

What building current Mathlib from scratch on a 32-hardware threads machine looks like

Brief respite from the rain. What a summer!

Me, sophisticated: "Parmesan demon core"

My friends were kind enough to leave my body with the capybaras

We were in a wildlife park on Friday and the responsibility fell to me to explain the concept of Flat Fuck Friday

We are well-equipped at the office. We have booths for both large land mammals as well as French people.

Carleson's Theorem [1] is fully formalised in Lean! https://github.com/fpvandoorn/carleson/pull/453 1] [https://en.wikipedia.org/wiki/Carleson's_theorem "Carleson's original proof is exceptionally hard to read, and although several authors have simplified the argument there are still no easy […]

"Waning Gibbous" still sounds like a name George Lucas came up with to me

Well we made it https://unnamed.website/posts/bad-apple-lean-tactic/

Inspiring to see someone managing to surpass the heights of BER Airport https://youtu.be/QEELOLsnY5A

I made a lil visualization of how far I've already spread the module system through the Lean std libs

Happy big train

Finally de-jetlagged yesterday just in time to spend almost the entire day on the hallway track answering very interested questions! ...so naturally time to re-jetlag today

who is little friend under table

"It's good enough" - Buger Buger

Turns out under the current flight avoidance zones, you can fly exactly 9000km from Munich to have breakfast right over Beijing and have just over 1000km to Seoul left. See you at PLDI?

Such a good move that they replaced the old and gnarly `git heckout` with the new and shiny `git witch`

The favorite café DELIVERED once more today Not pictured: all ingredients are rescues

Germany frfr

Knowing the input language of a software system greatly facilitates its (automated) testing. In our new GDBMiner work, we use the GNU debugger (GDB) to extract precise input grammars from any recursive descent parser that can be traced via GDB: https://doi.org/10.4230/LITES.10.1.1

The best thing about tagging commits as `feat` is that you can typo it as `feta`

Oops when did that happen

One down, 24 to go The question whether you would gift this to someone you like or you loathe remains open