I am happy to share my latest work ``Folding Mixed-Integer Linear Programs and Reflection Symmetries'', where I formulate two new presolving techniques for handling symmetries in linear programs and mixed-integer linear programs. Check out the preprint here: lnkd.in/efgYeVSJ lnkd.in/eGpim7U9

Thanks for all the OptiBeer @optimizer.bsky.social @jefflinderoth.bsky.social and for the OptiWine @lauraalbertphd.bsky.social Heading back to Corn Land from Dairy Land after a day packed with very interesting research discussions

It’s an incredible honor to be a plenary speaker at #ISMP2027 alongside these amazing optimizers. I look forward to seeing all my optimization friends in Amsterdam!

There are many things about preparing and presenting slides that I keep repeating to students, so I figured that I should put them down in writing. I do think that they help a lot. (And if I am doing it, why not share it more broadly?) thiagoserra.com/2026/03/03/m...

Saving peer review from AI slop requires getting rid of anonymous submissions and reviews togelius.blogspot.com/2026/03/savi...

Come see me speak about the new era of simplex method theory. Wednesday!

Mark your calendars and start optimizing your resources and schedules: the 2027 International Symposium on Mathematical Programming will be held from July 25 to to 30 in beautiful Amsterdam! Neil Yorke-Smith and I will organize the stream Discrete Optimization with Machine Learning. #ismp2027

📢 #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

And... we are back on 🎉! The first talk of the season will be delivered by Sophie Huiberts (CNRS, @sophie.huiberts.me), on ⏰ March 4 (10am PT, 1pm ET, 19:00 CET): "Analyzing the Simplex Method by the Book" RSVP to receive the link (one day before the talk): forms.gle/aD621bCwswjB...

Have you noticed how navigation apps include walking & waiting for public transit, but excludes parking & walking for driving? After being late a few times 😅, we finally did. We got curious: what if these apps account for parking?

Question for #orms people: do you know any problem-specific cutting planes that are not too hard to explain and separate and would improve performance compared to a baseline MIP solver (e.g. SCIP, Gurobi)? Asking because its more fun for students if they implement something and it helps performance

our #openaccess book on "branch-and-price" is finally published; you can download it here link.springer.com/book/10.1007... #orms @springernature.com

1/ ProPublica collected handwritten letters in mid-January from children held at the Dilley Immigration Processing Center, the same facility where 5-year-old Liam Conejo Ramos was taken. Hundreds of kids are still detained. We’ll let the children’s words speak for themselves. 🧵

📣 𝗣𝗼𝘀𝘁𝗱𝗼𝗰 𝗼𝗽𝗲𝗻𝗶𝗻𝗴𝘀 𝗶𝗻 𝗺𝘆 𝗴𝗿𝗼𝘂𝗽! I’m looking to hire 𝟭–𝟮 𝗽𝗼𝘀𝘁𝗱𝗼𝗰𝘀 to work with us across the group’s research areas, including: 🤖 Deep reinforcement learning 🚦 Traffic modeling & control 🧠 Neural combinatorial optimization

A reminder to the news media: “conflicting accounts” is what you say BEFORE the incontrovertible video evidence appears. After that, your job is to ask why one side is lying, not to repeat the lie and pretend no one knows the truth.

Alex Pretti was an ICU nurse serving veterans. He died trying to protect protestors being assaulted. A group of anonymous & masked men fired chemicals into his face, beat him, disarmed him, and shot him in broad daylight in front of witnesses. Then his government smeared him & defended his murder.

This looks like an execution. There must be an investigation. There must be accountability. Joining ICE does not give you license to murder. The President is escalating the situation—and I have no faith he will stop. The Republican Congress must join us to end this. Enough.

It’s -9 degrees. Downtown Minneapolis is packed for the anti-ICE rally and the crowd keeps growing

Happy to chair this year’s Lifetime Achievement in Location Analysis Award committee with co-chairs Dr. Sibel Alumur Alev (University of Waterloo) and Dr. Rajan Batta (University at Buffalo). Please see the call for nominations and help spread the word!

to turn off autoplaying video on the bluesky mobile app select the icon in the top left corner go to settings go to content and media make sure "autoplay videos and gifs" is toggled off

I’m happy to share that I’m starting my term as President of @informs.bsky.social Section on Location Analysis. I look forward to continuing to serve our community, leading SOLA activities, supporting our members, and strengthening the impact of location analysis research and applications.

I've written an end of year substack post about tracking Trump, where we are ending the year and some implications for Europe and for me personally... christinapagel.substack.com/p/personal-r...

"Nearly 80 years later, the simplex method is still among the most widely used tools when a logistical or supply-chain decision needs to be made under complex constraints." only half followed the description of the simplex method in here but super interesting anyways www.wired.com/story/resear...

New preprint! 📄 Data-driven convergence guarantees for first-order methods via PEP + Wasserstein DRO. Less pessimistic probabilistic rates that reflect how your solver actually behaves 🎯 📎 arxiv.org/abs/2511.17834 💻 github.com/stellatogrp/dro_pep w/ Jisun Park & Vinit Ranjan #optimization #fom

Care about gun control? Climate change? Gun control? Abortion rights? Gun control? Universal health care? Gun control? Higher education funding? Gun control? Abolishing ICE? Gun control? Ending murder on the high seas? Gun control? Etc. Your platform is <institutional reform>

After 18+ years working for Maplesoft, I was "downsized" on Black Friday and I am currently on the lookout for new opportunities. I will be looking in earnest in the new year, but any leads on math programming/teaching work (especially in Los Angeles) would be appreciated.

As newsrooms shutter and paywalls rise elsewhere, public media delivers critical, unbiased reporting without fear or favor. That's the promise of a free press in a democracy. Click here to support the network of voices that keeps our public conversation honest and informed: n.pr/4pCcFIx

I’m excited to share the materials from my Stanford seminar course, “AI for Algorithmic Reasoning and Optimization”: vitercik.github.io/ai4algs_25/. It covered formal algorithmic frameworks for analyzing LLM reasoning, GNNs for combinatorial/mathematical optimization, and theoretical guarantees.

⚠️ WANTED: PhD student ⚠️ The topic? GPU-friendly algorithms for discrete optimization and mathematical programming, to be used inside decision-focused learning pipelines. The mentors? My colleague Axel Parmentier and myself. [1/3]

Along with advancing optimization and game-theory research for post-disaster aid, Prof. Michini’s NSF CAREER Award supports new courses and researcher visits to help students learn the field: “I want to break that barrier…between professors and students..."🔗go.wisc.edu/zeuiau @uwmadison.bsky.social

Lately, I have been obsessed with developing theoretically based optimization algorithms that actually attain the best practical performance. Alas, the classic model of minimax optimal methods is overly conservative; it overfits to tune its worst-case. We found a path forward 1/

Alberto Del Pia Projection-width: a unifying structural parameter for separable discrete optimization https://arxiv.org/abs/2511.02990

Anna Deza, Georgina Hall Sum of Squares Submodularity https://arxiv.org/abs/2510.24550

The simplex algorithm is super efficient. 80 years of experience says it runs in linear time. Nobody can explain _why_ it is so fast. We invented a new algorithm analysis framework to find out.

Any serious future for democracy in America requires us to get rid of single-member districts. It is the only long-term solution to this nonsense.

🎉 Our very own Professor Laura Albert has been named a 2025 INFORMS Fellow! This prestigious honor recognizes her outstanding contributions to operations research, analytics, and data science. 💡📊 We’re so proud of you, Laura — keep changing the world! @INFORMS

@sophie.huiberts.me is featured in a Quanta magazine article about the simplex method. www.quantamagazine.org/researchers-...

Periodic appreciation post for this gem of a review by Hannah Bast and coauthors. If you think you know how to compute shortest paths... trust me, you don't. I can give you one spoiler though: preprocessing the graph helps A LOT. doi.org/10.1007/978-...

@jannisku.bsky.social is giving a very interesting talk on explainable (integer) optimization at the @euroorml.bsky.social seminar, highlighting counterfactual explanations before diving on new work with Coherent Local Explanations for Mathematical Optimization (CLEMO): arxiv.org/abs/2502.04840

We are hiring two faculty positions in ISyE at UW-Madison Please come and join us! jobs.wisc.edu/jobs/assista... jobs.wisc.edu/jobs/assista...

"Republicans run the entire government but can't keep it open" That's it. That's the whole story.

Here is a list of Winter / Summer schools on AI, data science, optimization, and related topics in operations research happening between October of 2025 and February of 2026: thiagoserra.com/2025/09/22/w...

settings > content & media > autoplay video & gifs = off

📢 New in JMLR (w @rajivsambharya.bsky.social)! 🎉 Data-driven guarantees for classical & learned optimizers via sample bounds + PAC-Bayes theory. 📄 jmlr.org/papers/v26/2... 💻 github.com/stellatogrp/...

I wrote a tutorial inspired by my experience conducting research with undergraduate students who knew how to code, but were yet to learn about optimization. What is the Best Way to Do Something? A Discreet Tour of Discrete Optimization: github.com/thserra/disc...

I wrote about the tragic death of Adam Raine and the venal negligence of "AI Safety." www.argmin.net/p/the-banal-...

Nobody covers Wisconsin politics better than @danshafer.bsky.social & you should take advantage of this great deal

Israel had every right to respond to Hamas' 7 Oct 2023 attacks. But this has NOT been a proportionate response: it has been an escalating campaign of war crimes, crimes against humanity & genocide as the world just watches. It is fair to hold Israel to a higher standard than Hamas terrorists. 5/5

The #FutureBAProf workshop continues with Tallys Yunes, the 22-time winner of University of Miami Herbert Business School Excellence in Teaching award, sharing about teaching in business schools. 1/2