Rolf van der Hulst
@rolfvanderhulst.bsky.social
PhD Student in Mathematical Optimization at University of Twente
Reposted by Rolf van der Hulst
📚 New Arxiv Paper
Title: Linear Programming Hierarchies Collapse under Symmetry
Authors: Yuri Faenza, V\'ictor Verdugo, Jos\'e Verschae, Mat\'ias Villagra
Read more: https://arxiv.org/abs/2511.07766
Title: Linear Programming Hierarchies Collapse under Symmetry
Authors: Yuri Faenza, V\'ictor Verdugo, Jos\'e Verschae, Mat\'ias Villagra
Read more: https://arxiv.org/abs/2511.07766
November 12, 2025 at 11:52 AM
📚 New Arxiv Paper
Title: Linear Programming Hierarchies Collapse under Symmetry
Authors: Yuri Faenza, V\'ictor Verdugo, Jos\'e Verschae, Mat\'ias Villagra
Read more: https://arxiv.org/abs/2511.07766
Title: Linear Programming Hierarchies Collapse under Symmetry
Authors: Yuri Faenza, V\'ictor Verdugo, Jos\'e Verschae, Mat\'ias Villagra
Read more: https://arxiv.org/abs/2511.07766
Does there exist a commonly used public instance benchmark set for robust optimization? Or sets of instances which are frequently used within the literature?
November 6, 2025 at 10:48 PM
Does there exist a commonly used public instance benchmark set for robust optimization? Or sets of instances which are frequently used within the literature?
Reposted by Rolf van der Hulst
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! :-)
Reposted by Rolf van der Hulst
🔄 Updated Arxiv Paper
Title: Implied Integrality in Mixed-Integer Optimization
Authors: Rolf van der Hulst, Matthias Walter
Read more: https://arxiv.org/abs/2504.07209
Title: Implied Integrality in Mixed-Integer Optimization
Authors: Rolf van der Hulst, Matthias Walter
Read more: https://arxiv.org/abs/2504.07209
July 15, 2025 at 8:16 AM
🔄 Updated Arxiv Paper
Title: Implied Integrality in Mixed-Integer Optimization
Authors: Rolf van der Hulst, Matthias Walter
Read more: https://arxiv.org/abs/2504.07209
Title: Implied Integrality in Mixed-Integer Optimization
Authors: Rolf van der Hulst, Matthias Walter
Read more: https://arxiv.org/abs/2504.07209
Reposted by Rolf van der Hulst
This is now out, we're super proud to have won the Land-Doig MIP competition prize for our algorithm for mixed-integer quadratic optimization!
Jan Kronqvist announces at the #mip2025 workshop that the MIP Competition will be from now on known as the Land-Doig MIP Competition.
The winners this year are a team from the Zuse Institute Berlin, represented by Gioni Mexi, who presents their approach based on branch-and-bound with Frank-Wolfe.
The winners this year are a team from the Zuse Institute Berlin, represented by Gioni Mexi, who presents their approach based on branch-and-bound with Frank-Wolfe.
June 4, 2025 at 9:44 PM
This is now out, we're super proud to have won the Land-Doig MIP competition prize for our algorithm for mixed-integer quadratic optimization!
Reposted by Rolf van der Hulst
passagemath 10.5.27 contains (a preliminary version of) the new package passagemath-cmr, an interface to the Combinatorial Matrix Recognition library by Matthias Walter et al., implementing Seymour's decomposition of TU matrices etc.
pypi.org/project/pass...
#Python #SageMath #OpenSource #MathSky
pypi.org/project/pass...
#Python #SageMath #OpenSource #MathSky
passagemath-cmr
passagemath: Combinatorial matrix recognition
pypi.org
April 27, 2025 at 7:46 PM
passagemath 10.5.27 contains (a preliminary version of) the new package passagemath-cmr, an interface to the Combinatorial Matrix Recognition library by Matthias Walter et al., implementing Seymour's decomposition of TU matrices etc.
pypi.org/project/pass...
#Python #SageMath #OpenSource #MathSky
pypi.org/project/pass...
#Python #SageMath #OpenSource #MathSky
After attempting to tune MIR cuts in SCIP for 3.5 days, I understand better why people are willing to pay so much for a commercial MIP solver license.
February 20, 2025 at 10:28 AM
After attempting to tune MIR cuts in SCIP for 3.5 days, I understand better why people are willing to pay so much for a commercial MIP solver license.
Reposted by Rolf van der Hulst
🔄 Updated Arxiv Paper
Title: Sparsity-driven Aggregation of Mixed Integer Programs
Authors: Liding Xu, Gioni Mexi, Ksenia Bestuzheva
Read more: https://arxiv.org/abs/2502.01192
Title: Sparsity-driven Aggregation of Mixed Integer Programs
Authors: Liding Xu, Gioni Mexi, Ksenia Bestuzheva
Read more: https://arxiv.org/abs/2502.01192
February 5, 2025 at 8:04 AM
🔄 Updated Arxiv Paper
Title: Sparsity-driven Aggregation of Mixed Integer Programs
Authors: Liding Xu, Gioni Mexi, Ksenia Bestuzheva
Read more: https://arxiv.org/abs/2502.01192
Title: Sparsity-driven Aggregation of Mixed Integer Programs
Authors: Liding Xu, Gioni Mexi, Ksenia Bestuzheva
Read more: https://arxiv.org/abs/2502.01192
Reposted by Rolf van der Hulst
registration for the 2025 school on column generation is now open www.gerad.ca/colloques/Co... #orms
2025 School on Column Generation
www.gerad.ca
February 3, 2025 at 4:08 PM
registration for the 2025 school on column generation is now open www.gerad.ca/colloques/Co... #orms
Reposted by Rolf van der Hulst
The bugfix release 9.2.1 of the SCIP Optimization Suite is now available.
This brings updates to GCG, PaPILO, SCIP, and SoPlex:
- github.com/scipopt/gcg/...
- github.com/scipopt/papi...
- github.com/scipopt/scip...
- github.com/scipopt/sopl...
#orms
This brings updates to GCG, PaPILO, SCIP, and SoPlex:
- github.com/scipopt/gcg/...
- github.com/scipopt/papi...
- github.com/scipopt/scip...
- github.com/scipopt/sopl...
#orms
gcg/CHANGELOG at v371 · scipopt/gcg
Contribute to scipopt/gcg development by creating an account on GitHub.
github.com
January 31, 2025 at 8:34 AM
The bugfix release 9.2.1 of the SCIP Optimization Suite is now available.
This brings updates to GCG, PaPILO, SCIP, and SoPlex:
- github.com/scipopt/gcg/...
- github.com/scipopt/papi...
- github.com/scipopt/scip...
- github.com/scipopt/sopl...
#orms
This brings updates to GCG, PaPILO, SCIP, and SoPlex:
- github.com/scipopt/gcg/...
- github.com/scipopt/papi...
- github.com/scipopt/scip...
- github.com/scipopt/sopl...
#orms
Reposted by Rolf van der Hulst
I recorded my current talk for youtube! If you are interested in linear programming or theoretical computer science, this is for you
Open Problems & Diet Problems
YouTube video by Sophie Huiberts
youtu.be
December 10, 2024 at 4:01 PM
I recorded my current talk for youtube! If you are interested in linear programming or theoretical computer science, this is for you
Reposted by Rolf van der Hulst
The #mip2025 computational competition is open! This year’s topic is finding feasible solutions for MIPs with quadratic functions. Student participation is encouraged and we may separately award outstanding student submissions. For more details, visit www.mixedinteger.org/2025/competi... #orms
December 7, 2024 at 8:09 PM
The #mip2025 computational competition is open! This year’s topic is finding feasible solutions for MIPs with quadratic functions. Student participation is encouraged and we may separately award outstanding student submissions. For more details, visit www.mixedinteger.org/2025/competi... #orms
Reposted by Rolf van der Hulst
I am very pleased to announce that a 1996 paper I wrote on graph coloring and column generation with Anuj Mehrotra was given a "Test of Time" award by the INFORMS Journal of Computing for papers written 1995-1999. The full citation is at pubsonline.informs.org/doi/10.1287/...
Note from the Editor | INFORMS Journal on Computing
pubsonline.informs.org
December 3, 2024 at 2:43 PM
I am very pleased to announce that a 1996 paper I wrote on graph coloring and column generation with Anuj Mehrotra was given a "Test of Time" award by the INFORMS Journal of Computing for papers written 1995-1999. The full citation is at pubsonline.informs.org/doi/10.1287/...