Martin Schmidt
@schmaidt.bsky.social
This is about craftbeer & homebrewing, sourdough bread baking, mathematical optimization, OR, photography, cooking, and random rant!
It took quite some time, but our paper "Column Generation in Column-and-Constraint Generation for Adjustable Robust Optimization with Interdiction-Type Linking Constraints" (jointly with @hlefebvr.bsky.social & J. Thürauf) has now been accepted for publication in MPC:
tinyurl.com/37mjskha
tinyurl.com/37mjskha
December 3, 2025 at 12:35 PM
It took quite some time, but our paper "Column Generation in Column-and-Constraint Generation for Adjustable Robust Optimization with Interdiction-Type Linking Constraints" (jointly with @hlefebvr.bsky.social & J. Thürauf) has now been accepted for publication in MPC:
tinyurl.com/37mjskha
tinyurl.com/37mjskha
November 24, 2025 at 8:57 PM
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
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
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
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
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
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
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
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
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...
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
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...
You compute an approximate one!
Here‘s how you can do this via branch-and-cut:
optimization-online.org/wp-content/u...
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
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!
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
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
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
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
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
Let's move on with my little metro station series from Stockholm.
Today, Part 3: #Rinkeby
#travel #travelphoto #swedenphotography #metro #underground #travelphotographer
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! :-)
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
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! :-)
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! :-)
SCHMAIDT'S NERD BREWING presents ... VIENNA CALLING (Beer Festival Trier 2025 Edition)
A bit more than a week to go!
A bit more than a week to go!
September 30, 2025 at 6:08 PM
SCHMAIDT'S NERD BREWING presents ... VIENNA CALLING (Beer Festival Trier 2025 Edition)
A bit more than a week to go!
A bit more than a week to go!
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!
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
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!
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!
@yasminebeck.bsky.social is continuing her PhD-prize-collecting conference tour!
This time the PhD prize of the German OR society!
Congratulations! 💪
This time the PhD prize of the German OR society!
Congratulations! 💪
September 4, 2025 at 6:43 AM
@yasminebeck.bsky.social is continuing her PhD-prize-collecting conference tour!
This time the PhD prize of the German OR society!
Congratulations! 💪
This time the PhD prize of the German OR society!
Congratulations! 💪
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
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
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
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
Once upon a time in Lausanne, Switzerland!
#travel #blackwhite #blackwhitephotography #blackandwhite #lausanne #suisse🇨🇭 #suisse #schweiz #switzerland
#travel #blackwhite #blackwhitephotography #blackandwhite #lausanne #suisse🇨🇭 #suisse #schweiz #switzerland
August 21, 2025 at 2:16 PM
Once upon a time in Lausanne, Switzerland!
#travel #blackwhite #blackwhitephotography #blackandwhite #lausanne #suisse🇨🇭 #suisse #schweiz #switzerland
#travel #blackwhite #blackwhitephotography #blackandwhite #lausanne #suisse🇨🇭 #suisse #schweiz #switzerland
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
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.
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
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.
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.
Once upon a time at Lac Leman, #switzerland🇨🇭 ...
A beautiful #lake with beautiful light. #Photo taken in March 2025.
#lake #light #clouds #blackwhite #blackandwhite #blackandwhitephoto #blackwhitephotography #landscape #seascape #mountains #switzerland #schweiz #travel #travelphoto #roadtrip
A beautiful #lake with beautiful light. #Photo taken in March 2025.
#lake #light #clouds #blackwhite #blackandwhite #blackandwhitephoto #blackwhitephotography #landscape #seascape #mountains #switzerland #schweiz #travel #travelphoto #roadtrip
July 25, 2025 at 1:00 PM
Once upon a time at Lac Leman, #switzerland🇨🇭 ...
A beautiful #lake with beautiful light. #Photo taken in March 2025.
#lake #light #clouds #blackwhite #blackandwhite #blackandwhitephoto #blackwhitephotography #landscape #seascape #mountains #switzerland #schweiz #travel #travelphoto #roadtrip
A beautiful #lake with beautiful light. #Photo taken in March 2025.
#lake #light #clouds #blackwhite #blackandwhite #blackandwhitephoto #blackwhitephotography #landscape #seascape #mountains #switzerland #schweiz #travel #travelphoto #roadtrip
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
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 #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
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
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
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
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
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
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...
link.springer.com/article/10.1...
July 16, 2025 at 1:51 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...
link.springer.com/article/10.1...
Schmaidt's Nerd Brewing proudly presents ...
SOL Y SAL
#beer #craftbeer #craft #homebrew #homebrewing #mexican #lager #mexicanlager #Motueka #Gose #lime #lemon #kegerator #salt
SOL Y SAL
#beer #craftbeer #craft #homebrew #homebrewing #mexican #lager #mexicanlager #Motueka #Gose #lime #lemon #kegerator #salt
July 14, 2025 at 6:47 PM
Schmaidt's Nerd Brewing proudly presents ...
SOL Y SAL
#beer #craftbeer #craft #homebrew #homebrewing #mexican #lager #mexicanlager #Motueka #Gose #lime #lemon #kegerator #salt
SOL Y SAL
#beer #craftbeer #craft #homebrew #homebrewing #mexican #lager #mexicanlager #Motueka #Gose #lime #lemon #kegerator #salt
Springer completely messed this up when they published it first for the first time (without waiting for a galley proof reading and comments).
Better don’t go the the publisher’s version at all - please read the preprint version at Optimization Online:
optimization-online.org?p=24743
Better don’t go the the publisher’s version at all - please read the preprint version at Optimization Online:
optimization-online.org?p=24743
July 14, 2025 at 7:28 AM
Springer completely messed this up when they published it first for the first time (without waiting for a galley proof reading and comments).
Better don’t go the the publisher’s version at all - please read the preprint version at Optimization Online:
optimization-online.org?p=24743
Better don’t go the the publisher’s version at all - please read the preprint version at Optimization Online:
optimization-online.org?p=24743
The biggest publishing nightmare of my life came to an end this morning. Our paper "On a Tractable Single-Level Reformulation of a Multilevel Model of the European Entry-Exit Gas Market with Market Power" has now been published in its “publisher correction” version:
link.springer.com/article/10.1...
link.springer.com/article/10.1...
July 14, 2025 at 7:28 AM
The biggest publishing nightmare of my life came to an end this morning. Our paper "On a Tractable Single-Level Reformulation of a Multilevel Model of the European Entry-Exit Gas Market with Market Power" has now been published in its “publisher correction” version:
link.springer.com/article/10.1...
link.springer.com/article/10.1...
That one has the potential to get a really nice juice!
Let’s cold crash it now …
#craftbeer #homebrew #beer #homebrewing #IPA #NEIPA #Hazy
Let’s cold crash it now …
#craftbeer #homebrew #beer #homebrewing #IPA #NEIPA #Hazy
July 11, 2025 at 7:29 AM
That one has the potential to get a really nice juice!
Let’s cold crash it now …
#craftbeer #homebrew #beer #homebrewing #IPA #NEIPA #Hazy
Let’s cold crash it now …
#craftbeer #homebrew #beer #homebrewing #IPA #NEIPA #Hazy