Martin Schmidt
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schmaidt.bsky.social
Martin Schmidt
@schmaidt.bsky.social
This is about craftbeer & homebrewing, sourdough bread baking, mathematical optimization, OR, photography, cooking, and random rant!
Save the date!

The International Conference on Bilevel Optimization will take place from August 2-5, 2026, at the CMU and the University of Pittsburgh, USA!

Here's all what you need to know right now:

bileveloptimization.org/icbo/2026/in...
ICBO 2026
bileveloptimization.org
November 14, 2025 at 9:18 AM
The game-theory weeks go on 😀

Today: How to solve a GNEP by solving a NEP? Here is the answer in our new paper "A One-Extra Player Reduction of GNEPs to NEPs" (jointly with David Salas from Chile and @hlefebvr.bsky.social from @unitrier.bsky.social):

tinyurl.com/3mytcvwn

#GameTheory #Mathematics
November 13, 2025 at 10:34 AM
Still searching for remedies in case no exact equilibria exist?

Here is our answer for #Walras equilibrium problems: Just try to minimize the regret!

All the details can be found in our new preprint: tinyurl.com/2nwkb6pa.

@unitrier.bsky.social #GameTheory #Mathematics #Optimization
November 12, 2025 at 10:47 AM
What do you do if your mixed-integer Nash game does not have an equilibrium?

You compute an approximate one!

Here‘s how you can do this via branch-and-cut:

optimization-online.org/wp-content/u...
November 6, 2025 at 10:11 AM
Once upon a time in Stockholm, Sweden!

A classic photo during a classic photo time during the day taking from a classic photo spot of the city. Anyways, I like it!

#travelphoto #travelphotographer #bluehour #stockholm #sweden #sea #sky #cityscape #nightphotography #longtime #exposure #photography
November 5, 2025 at 9:12 AM
Once upon a time in #Stockholm, #Sweden

Let's move on with my little metro station series from Stockholm.

Today, Part 3: #Rinkeby

#travel #travelphoto #swedenphotography #metro #underground #travelphotographer
October 28, 2025 at 8:34 PM
This was hard work but now we are happy!

The #BOBILib paper has today been accepted for publication in Mathematical Programming Computation!

Here's the final version of the preprint: optimization-online.org/wp-content/u...!

And here's the website bobilib.org!

Spread the word and use it! :-)
October 22, 2025 at 3:47 PM
Reposted by Martin Schmidt
The 5th EUROYoung Workshop started yesterday! We were amazed by the incredible talk given by our first plenary speaker, @schmaidt.bsky.social #EUROYoung2025 #orms
October 16, 2025 at 6:43 AM
German News Wrap-Up:

„Wir verschieben die Debatte, weil wir uns nicht einig sind!“

Es grüßt der demokratische 💀

oh boy …
October 6, 2025 at 8:02 PM
SCHMAIDT'S NERD BREWING presents ... VIENNA CALLING (Beer Festival Trier 2025 Edition)

A bit more than a week to go!
September 30, 2025 at 6:08 PM
Once upon a time in Stockholm‘s underground.

Let’s continue this series of metro station #photos from #sweden with Solna Centrum Station!
September 20, 2025 at 7:48 AM
You want to learn about Equilibrium Problems à la Nash, Stackelberg, Arrow & Debreu, ...? Then join us at the

TRR 154 AUTUMN SCHOOL ON
EQUILIBRIUM PROBLEMS

www.trr154.fau.de/autumn-schoo...
TRR154 Autumn School 2025
Your browser does not support HTML5 video. TRR 154 Autumn School on Equilibrium Problems November 5 - 7,  2025Berlin ...
www.trr154.fau.de
September 20, 2025 at 6:47 AM
Once upon a time in Stockholm‘s underground!

A series about the #Stockholm metro stations was on my #photography todo list since 2022 when I was in this wonderful capital of #Sweden for the first time!

This year, I finally found the time and here‘s the #photo of the first stop: #Akalla!
September 13, 2025 at 7:25 AM
@yasminebeck.bsky.social is continuing her PhD-prize-collecting conference tour!

This time the PhD prize of the German OR society!

Congratulations! 💪
September 4, 2025 at 6:43 AM
Once upon a time in #Stockholm, #Sweden

Why not posting some old but unpublished shots from Stockholm while being in Stockholm again?

#travel #travelphotos #blue #hour #bluehour #cityscape #gamlastan #wideformat #night #photography #nightphotography #travelphotography #travelphoto #scandinavia
September 2, 2025 at 8:13 AM
You want to use the BOBILib (bobilib.org) instances to test your new bilevel optimization solver?

And you don't want to code your own parser?

No problem, use this one: gitlab.uni-trier.de/nlopt/mps-au...!
BOBILib: Bilevel Optimization (Benchmark) Instance Library
bobilib.org
August 22, 2025 at 12:58 PM
August 21, 2025 at 2:16 PM
Final deadline extension for the

International Workshop on Algorithmic Optimization

at @unitrier.bsky.social, Germany, which takes place

September 23-26.

Registration is open until Friday, August 15! Don't miss it!

alop.uni-trier.de/event/intern...
International Workshop on Algorithmic Optimization | ALOP
alop.uni-trier.de
August 11, 2025 at 12:15 PM
SCHMAIDT'S NERD BREWING ... proudly presents ... HOLLE'S SUMMER JUICE 2025

I am slowly getting to where I want my New England IPA journey to head to. A bright-yellow-milky-hazy appearance, a stable and super-white head.

#homebrew #brewing #brew #craft #beer #craftbeer #IPA #neipa #hazyipa #hazy
August 10, 2025 at 7:18 PM
Once upon a time in Zurich!

I don’t know why but I ignored the country for far too long. But this year, I had the chance to visit Switzerland 🇨🇭 twice and Zurich once.
August 2, 2025 at 3:02 PM
July 25, 2025 at 1:00 PM
Once upon a time in #Annecy

For sure one of the most positive surprises in our #travel life so far — a beauty with a nice old town, #mountains, a beautiful #lake, good restaurants, and even some nice #craftbeer pubs 😉

#france #france🇫🇷 #travel #travelphoto #street #photography #streetphotography
July 23, 2025 at 4:42 PM
Once upon a time in Zurich, Switzerland

The Negrellisteg was on my #photography todo list since quite some time. This year, I was finally able to capture it!

More of such stuff you'll find at www.schmaidt.de.

#photo #traveling #travel #Zurich #Zürich #Switzerland #Schweiz #architecture
July 18, 2025 at 12:43 PM
Yet another paper alert: Our paper "Mixed-Integer #Bilevel Optimization with Nonconvex Quadratic Lower-Level Problems: #Complexity and a Solution Method" (jointly with Immanuel Bomze and Andreas Horländer) is published in the Journal of Global #Optimization.

link.springer.com/article/10.1...
July 16, 2025 at 1:51 PM