As I am preparing my calculus notes for next year, the resolution of the jacobian conjecture comes at the perfect time! Today I've learned a few things surrounding this result, which i'll gather in a thread 1/n

Rebrand optimization as argmaxxing

George Dantzig died in 2005. Does anyone have any color photographs of him?

Indeed! Also interesting that there was no urge to emphasize *human* computation or *human* calculation when it became possible that non-humans do these (or was there?)

Michael Kinyon@profkinyon.bsky.social · 3mo ago

It's interesting that mathematicians now feel a strong urge to put the word "human" in front of the word "proof".

The International Centre for Mathematical Sciences (ICMS, Edinburgh) is looking for a new Director. Application deadline is July 15. Please share this information with anyone who might be interested. icms.ac.uk/icms-seeks-n...

ICMS seeks new Director - ICMS

ICMS seeks a new director as the tenure of our current Director, Minhyong Kim, comes to an end this summer.

icms.ac.uk

Every optimization problem is linear if you lift enough

I noticed that LLMs already affect student presentations a lot, but now at #SIAMOP26 I realize that also here, people use ChatGPT et al. to produce their slides (at least, that's the obvious explanation for all the "Why this matters" boxes I see on slides...)

That's a hell of a venue for a plenary talk here at #SIAMOP26

The exponential function has the remarkable property that it is the unique function f that satisfies the differential equation f'(x) = exp(x) with initial value f(0)=1.

Everybody is dead. Chuck Norris is still alive.

Modern technology makes conference evenings in the hotel much more enjoyable!

Prove that you are human - once and for all I can't get past level 4 🤖😬 neal.fun/not-a-robot/

I'm Not a Robot

Prove your humanity once and for all

neal.fun

📢 #ISMP2027 comes to Amsterdam! The 26th International Symposium on Mathematical Programming will be held July 25–30, 2027. Join researchers from around the world to discuss advances, challenges, and opportunities in the theory and practice of mathematical optimization. 🔗 ismp2027.mathopt.nl #MOS

Am I right that a function that is not increasing and also not decreasing is in fact just creasing?

Thomas Steinke@stein.ke · 12mo ago

Why do we use "non-decreasing" as a synonym for increasing? The negation is confusing. E.g., the sine function is not decreasing. Is the distinction between strictly and non-strictly increasing meaningful?

So you tell me that when I call scipy's linprog with bounds=none, it uses a lower bound of zero?! Yeah, that makes a lot of sense #scipy!

I submit the following for the fifth derivative.

5 years ago today, Her Maths Story went live with our 1st story. What started as a small idea has grown into a global, supportive community celebrating #WomenInMaths. We’re deeply grateful to everyone who has shared, read, supported & believed in this journey. Here’s to the stories still to come 💛✨

Universidad Técnica Federico Santa María in Valparaiso has a quite iconic campus tbh

These tiles don't cease to amaze - with hexagonal holes you get a lot of symmetry!

And they mix! 🧮 #mathsky

Dirk Lorenz @dirque.bsky.social · 8mo ago

And another one!

And another one!

Dirk Lorenz @dirque.bsky.social · 8mo ago

New periodic pattern from aperiodic tiles dropped: 🧮 #mathsky

Funny Numbers xkcd.com/3184/

New periodic pattern from aperiodic tiles dropped: 🧮 #mathsky

Does anyone have a links to good writing on what "trivial" means in mathematics? How we might define that type of thing? I get why people don't like the term, I want to help students seek out trivial examples/results as a way of getting familiar with whatever property we're working with. #MathSky

New paper out! Together with my postdoc advisors @esoubies.bsky.social and Cédric Févotte :) We study the optimization landscape of L0-Bregman relaxations, which naturally arise when one optimizes non-quadratic fidelity terms coupled with the L0-norm. 1/n

arxiv math.OC@arxiv-math-oc.bsky.social · 9mo ago

Jonathan Chirinos-Rodriguez, C\'edric F\'evotte, Emmanuel Soubies Optimization landscape of $\ell_0$-Bregman relaxations https://arxiv.org/abs/2511.12157

New on arXiv: Why noise matters in learned regularization! Data-driven regularizers fail without noise structure. 🎯 Tikhonov, Lavrentiev, quadratic — not equal under non-white noise. 🤫 Spoiler: Optimal reconstruction needs proper noise modeling. 👉 Regularizer choice = structure and noise.

arxiv math.NA@arxiv-math-na.bsky.social · 11mo ago

Sebastian Banert, Christoph Brauer, Dirk Lorenz, Lionel Tondji Why the noise model matters: A performance gap in learned regularization https://arxiv.org/abs/2510.12521

What does it mean to do mathematics? Read my personal answer here: web.mathi.uni-heidelberg.de/content/uplo... #mathsky #math #question

So you agree that the sine function is not decreasing, but you won't say that it's non-decreasing? But alas math has such a precise language! 🧮

Thomas Steinke@stein.ke · 12mo ago

Why do we use "non-decreasing" as a synonym for increasing? The negation is confusing. E.g., the sine function is not decreasing. Is the distinction between strictly and non-strictly increasing meaningful?

Ta daaa! I give you the Lorentz Attractor thanks to the free pattern from #ThreadedTheorems and also @samjshah.bsky.social whose posted work I admired. #StemBroidery #MathArt #MathSky

Join us for a panel on “Careers in Mathematics of Data Science” tomorrow morning!

@siagdata.bsky.social · last yr.

Save the Date! The SIAM Activity Group on Data Science (SIAG/DATA) invites you to join us for a panel on the topic: Careers in Mathematics of Data Science Tuesday, August 12, 2025 | 9:00 AM PT | Zoom Webinar Panelists: Marta D’Elia, Elizabeth Newman, David Uminsky