Mixed Integer Programming Workshop 2026

There were ~ eight* elite weeks left before #mip2026 but soon it will be the final four. Hope to see you all May 18-21 at @uconn.bsky.social (Stamford campus). Early registration and the **flash talks** submission deadline are April 15. See details at mixedinteger.org/2026. #orms

* it’s actually 7

The Experience of Giving a Distinguished Engineering Lecture at Purdue University Was Extraordinary - Thank You! Last evening I returned from a whirlwind trip to Purdue University, where I was deeply honored to deliver a Distinguished Engineering Lectur...

New #orblog: The Experience of Giving a Distinguished Engineering Lecture at Purdue University was Extraordinary - Thank You! annanagurney.blogspot.com/2026/03/the-... #supplychains #agriculture #networks #industrialengineering #orms

a zoom window, with four participants: Guy Desaulniers, Marco Lübbecke, Jean Bertrand Gauthier, and Jacques Desrosiers

it is rare that we four meet - but we had something to celebrate

#orms

link.springer.com/book/10.1007...

a zoom window, with four participants: Guy Desaulniers, Marco Lübbecke, Jean Bertrand Gauthier, and Jacques Desrosiers

it is rare that we four meet - but we had something to celebrate

#orms

link.springer.com/book/10.1007/978-3-031-9...

DC Projects – ALMOA

13 PhD positions in in applied #maths, #orms, engineering, or CS within the ALMOA consortium

-> study applications of European and international relevance in areas such as sustainable energy systems, green gogistics, etc.

almoa.aau.at?page_id=53

On the number of degenerate simplex pivots - Mathematical Programming The simplex algorithm is one of the most popular algorithms to solve linear programs (LPs). Starting at an extreme point solution of an LP, it performs a sequence of basis exchanges (called pivots) that allows one to move to a better extreme point along an improving edge-direction of the underlying polyhedron. A key issue in the simplex algorithm’s performance is degeneracy, which may lead to a (potentially long) sequence of basis exchanges which do not change the current extreme point solution. In this paper, we prove that one can employ any improving feasible direction at an extreme point to limit the number of consecutive degenerate pivots that the simplex algorithm performs to $$n-m-1$$ n - m - 1 , where n is the number of variables and m is the number of equality constraints of a given LP in standard equality form.

on the number of degenerate simplex pivots

link.springer.com/article/10.1007/s10107-0...

#orms

On the number of degenerate simplex pivots - Mathematical Programming The simplex algorithm is one of the most popular algorithms to solve linear programs (LPs). Starting at an extreme point solution of an LP, it performs a sequence of basis exchanges (called pivots) th...

on the number of degenerate simplex pivots

link.springer.com/article/10.1...

#orms

A first look at the Nextmv MCP Server This release of the Nextmv MCP Server previews early functionality for interacting with Nextmv decision apps via AI agents in a safe, consistent, and reliable way.

We’ve shipped a preview release of the Nextmv MCP Server. Check it out: hubs.la/Q048xDwD0

#decisionOps #decisionscience #decisionintelligence #orms #ai #datascience #claude #mcp

In conversation with Pyomo and HiGHS: Open source in OR How are open source projects being used today? How should the community think about adoption and participation? Hear from members of the Pyomo and HiGHS teams.

In conversation about open source in OR: Research vs commercial software, open source applications in the wild, early project choices for HiGHS and #Pyomo, and what's next on the horizon: hubs.la/Q0487xhn0

#orms #decisionscience #decisionintelligence #decisionOps #opensource #datascience

ICBO 2026

The #ICBO2026 abstract submission deadline is coming soon:

bileveloptimization.org/icbo/2026/in...

I hope we meet later this year in Pittsburgh!

#orms #conference #bilevel #optimization

Spending part of my Saturday of spring break reviewing articles submitted to #orms journals. One review I just completed was for a paper I thoroughly enjoyed. Seeing originality and creativity in research and scholarship makes my day.

Kent meningitis outbreak triggers surge in UK vaccine demand, policy debate Young people in southeast England ​and beyond are lining up for the meningitis B vaccine after an outbreak killed two people, sparking supply warnings from pharmacies and raising broader questions abo...

In academia we are so connected - thinking of my #orms friends at the University of Kent and beyond www.reuters.com/business/hea... in 2017, @umassamherst.bsky.social had a meningitis B outbreak with two cases.

The trade-off between optimism and pessimism in multi-resource planning and allocation under demand uncertainty We study a stochastic multi-resource planning and allocation problem (SRAP) with uncertain demand. Given sets of demand nodes and multiple resource ty…

New solo-authored paper, the trade-off between optimism and pessimism in multi-resource planning and allocation under demand uncertainty, just came out in EJOR. You can access it here: www.sciencedirect.com/science/arti...
#orms

A new Nextmv CLI A simple one-line command unlocks everything you need for seamless DecisionOps-powered model development from your local machine to remote infra for testing and production runs.

👋 Hi to the new Nextmv CLI! A simple one-line command unlocks everything you need to go from local decision engine development to remote infra for testing and production runs: hubs.la/Q047xhMS0

#decisionOps #orms #decisionintelligence #decisionscience

“MIP approaches are a dead end.”

That‘s a reviewer comment I recently received on a paper about traffic modeling.

So, naturally, I teamed up to write another MIP paper on traffic networks. Here’s our new #ORMS preprint: optimization-online.org?p=34014

Dead end? Judge for yourselves 😉

To all the linear programming enthusiasts out there, how are you gearing up for dual variables day? #orms

How can you manage decision model versions on Nextmv? Let us count the ways… An overview of approaches for managing model versions for testing, roll out, roll back, and provisioning by geographic region, client, or development environment in the context of DecisionOps.

How can you manage decision model versions on Nextmv? 🤔 Let us count the ways... 🧐

Tour examples that manage model versions by dev environment, geographic region, client/customer, and shadow mode: www.nextmv.io/blog/how-can...

#orms #decisionOps #decisionscience #datascience

Coincidentally, we have published a paper with an @isenbergumass.bsky.social PhD student & a colleague in Ukraine on war risk insurance with the focus being on integrating crop and cargo (as in maritime) insurance under war conditions as in Ukraine onlinelibrary.wiley.com/doi/10.1111/... . #orms

Okay, who’s gonna MIP it first? And make a web interface? #orms

In conversation: Building stakeholder trust in decision intelligence Human review and feedback is part of any good decision workflow. Learn what decision algorithm developers and teams can do to increase trust and build confidence.

How to build trust in OR - Insights from Toyota, Hertz, Stitch Fix, and more: hubs.la/Q045TJPk0

→ “Once users start referring to it as ‘our algorithm'...you’re in business.”

#decisionOps #orms #datascience

Great to see a paper co-authored by a former PhD student of mine, now Dr. Ding Zhang, wth Dr. Ben Lev, and co-authors in this issue. #EJOR is one of my FAVORITE #orms journals.

is there also a stream for discrete optimization without machine learning? #orms

Yesterday, during the ceremony of the #Spanish Society of Statistics, Operations Research, and Data Science – #BBVAFoundation Awards, I received the #SEIO Medal. I feel very honored. This comes, of course, with the responsibility of being up to the level of previous medal awardees.

#orms

AI meets Operations Research: what this means for the OR practice – Doing the Math

AI can dramatically speed up model building and algorithm design. But it optimises the problem you give it, not the problem you actually have. That distinction matters enormously in complex decision-making. #orms #ai

doingthemath.nl/ai-meets-ope...

DecisionOps and reflections on the road ahead The future of operations research and decision science hinges on DecisionOps infrastructure, systems of record, and an integrated ecosystem.

As you think about the year ahead, do you want to spend time building (and maintaining) tools to build models? Or do you want to spend time building (and improving) models that deliver value to your business? hubs.la/Q044Qfxr0

#decisionOps #orms #decisionscience #logistics #supplychain

SpringerNature's book advertisement for the book "branch-and-price", shows the cover, the title and "open access"

some three weeks ago, our #openaccess book on "branch-and-price" got finally published; you can download it for free here: link.springer.com/book/10.1007/978-3-031-9...

#orms

Join us on March 5 for my #orms talk about uncertain #bileveloptimization!

Extended Deadline for #ICBO 2025, the
International Conference on Bilevel Optimization in Pittsburgh, US.

bileveloptimization.org/icbo/2026/in...

Register now and let's meet in August!

#orms #bilevel #optimization #conference

Yesterday we organized a presentation session about teaching practical hands-on courses for the Center of Algorithmics and Optimization (algoopt.rwth-aachen.de) at RWTH Aachen.

Proof-reading chapter 2: Optimistic vs pessimistic #bilevel problems.

What is a pessimistic problem? Why is it different? And why is it actually not as different as many people thought for a long time …

#orms #optimization