This pre-publication version is free to view and download for personal use only. Not for re-distribution, re-sale, or use in derivative works. ©Yasmine Beck, Ivana Ljubić, and Martin Schmidt 2026.
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This material will be published by Cambridge University Press as "Linear and Mixed-Integer Bilevel Optimization: Theory and Algorithms“ by Yasmine Beck, Ivana Ljubić, and Martin Schmidt.
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Our book "Linear and Mixed-Integer Bilevel Optimization: Theory and Algorithms" (w @yasminebeck.bsky.social & I. Ljubic) will be published soon but you can use the freely available pre-publication version from now on.
This is the direct link to the PDF: tinyurl.com/34m8yrfu.
Spread the word!
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The next #BOS Webinar takes place on April 28 at 4 PM CEST, featuring two 20-minute talks by Martina Cerulli and Kübra Tanınmış.
🔗 bileveloptimization.org/bos_webinar
📩 Details will be shared via the BOS mailing list. Not yet a BOS member? Register for free at bileveloptimization.org/membership!
It's done!
Our book "Linear and Mixed-Integer Bilevel Optimization: Theory and Algorithms" (jointly with @yasminebeck.bsky.social and Ivana Ljbuic) is sent to the publisher!
353 pages
18 chapters
223 references
> 40 figures
> 50 examples
> 60 exercises
🚀 The #BilevelOptimization Webinar Series kicks off next Tuesday!
Join us for the inaugural session with an opening by #BOS President Alain Zemkoho, followed by a 40-minute talk by Stephan Dempe.
We hope to see many of you there!
Not on the BOS mailing list yet? Send me a DM for the meeting link.
Gentle #bilevel #optimization reminder:
Today and tomorrow is your last chance to submit an abstract to the "International Conference on Bilevel Optimization" ...
Let's meet in Pittsburgh!
bileveloptimization.org/icbo/2026/su...
We started to work on this paper in 2019. Finally, it's out: "Multi-Leader Single-Follower Power-Market Modeling: The Impact of DC Market-Clearing on AC Feasibility" (jointly with Martina Cerulli, Claudia D'Ambrosio, and Leo Liberti).
Here you go: tinyurl.com/bdfnrf7w!
It's done! Our paper BOBILib: Bilevel Optimization (Benchmark) Instance Library (with Johannes Thürauf, Thomas Kleinert, Ivana Ljubic, and Ted Ralphs) is finally published in MPC!
It’s open access. And just a reminder: The website of the library is this one: bobilib.org
Use it and spread the word!
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
Anyways, I think it is a good beer that has no off-flavors & that meets the guidelines of the style. I will send it to #Bayreuth! Kill me now, dear Jury ;-
Is it outstanding enough to win any competition? I don't think so.
Still, I am very happy to share it. Who wants a bottle, PM please!
Cheers!
Second issue: I wanted it to be more clear. Let's see what time is doing to it - but this aspect I have to work on to improve similar styles in the future.
The hops are there for sure but - and this is one of the two main critical points that I see myself - that could have been a bit more spectacular given what have been throwing into the wort.
What do I think about it?
It is pretty clean for a lager yeast fermentation at 18°C (@ungespundet (at Insta) already announced to NOT believe this in the Lagerbier-Ultras WhatsApp group🤪). It is pretty bitter but the bitterness is incorporated rather nicely so that I do not experience it as harsh.
Water!
Rather low on minerals with a 3:1 ratio of sulfate over chloride to pronounce the bitterness & make it a crisper.
Yeast!
The #lager purists will kill me: I fermented the W34/70 @ 18°C.
Malts!
No adjuncts were allowed for the competition so I used 93% of Extra Pale Premium Pilsner, 3,5% of Munich II, and 3,5% of Vienna malt - the 2 latter ones mainly for a bit of malt complexity & color.
Hops!
For bittering I used Hallertauer Magnum, Centennial & Simcoe (just to make @friedies.brauhaus happy) for a late addition, Azacca, Motueka + Simcoe for the Whirlpool - and, finally - Azacca, Centennial+ Motueka for dry hopping.
Cold IPA. Did I brew it before? No. Did I had >10 examples of this beer style before on my own? No. Did I ever ferment a lager yeast at #ale #yeast temperatures? No. Did I ever try to get a clear beer after a heavy #DryHopping? No. Well, let's be ambitious.
...
Let's now finally post some serious stuff again ...
FrostByte - Cold IPA by Schmaidt's Nerd Brewing (7% ABV - 62 IBU - 16,3°P)
This is batch #49. Let's submit it to a competition. This time it is my 2nd one for a competition: the #HomeBrewBayreuth organized by @maisel_and_friends (see Insta)!
Just in case you need something to read over the weekend: Our new paper "A Successive Proximal DC Penalty Method with an Application to Mathematical Programs with Complementarity Constraints" (w D.Flocco, S. Gabriel, T. Boomsma, and M. Lejeune) is ready to be read:
optimization-online.org?p=33921
Chapter 7
The basics of branch-and-bound for MILPs … the deadline is coming ;-)
Chapter 6 of the upcoming book on #bilevel #optimization:
General properties of mixed-integer linear bilevel problems.
Classic relaxations, infeasibility via lower-level unboundedness and how to test this up-front, existence of solutions, the refinement problem, complexity, reformulations, ...
Ok! Thanks
Last paper post before traveling ;-)
Our preprint on "Branch-and-Cut for Mixed-Integer Linear Decision-Dependent Robust Optimization" (jointly with @hlefebvr.bsky.social, Simon Stevens, and Johannes Thürauf) is online:
tinyurl.com/jedwuhn9
Interesting. Thanks a lot.
I thought they also use some tricks while doing the pivoting to keep the numerics well-behaved for the next basis system to be solved ...
Really? I remember talking to Bixby a few times and he never wanted to say what the actual pivoting rule in CPLEX is (even not after a few glasses of wine 🍷) …
Is this written now somewhere?
Sure it is. I agree. But how can you know this since most of the codes (Gurobi, CPLEX, etc.) are commercial black boxes?
That’s a big achievement! Congratulations 🎊🍾🎉🎈 Marco!!!
What is this new era about?
I did the same a few years ago. Mine are online as well. If you want, I can share them. Will read yours tomorrow!