I am a Ph.D. student at HTW Berlin, conducting research within the Go!PPS project, and a guest researcher at the Zuse Institute Berlin (ZIB). My work focuses on the development and analysis of algorithms for mixed-integer and combinatorial optimization, with an emphasis on presolving techniques, high-performance computation, and GPU-accelerated optimization.
I am the maintainer of the presolving library PaPILO and an active contributor to the SCIP optimization framework, where I develop and refine algorithms for both theoretical and practical applications.
My current research explores GPU-based approaches to optimization problems, investigating how parallel computation can accelerate presolving and solver performance. I am particularly interested in collaborations that integrate high-performance computing techniques with advanced presolving strategies to tackle challenging large-scale optimization instances.
@InProceedings{10.1007/978-3-031-95976-9_3,
author="Hoen, Alexander and Gleixner, Ambros",
editor="Tack, Guido",
title="Analyzing the Numerical Correctness of Branch-and-Bound Decisions for Mixed-Integer Programming",
booktitle="Integration of Constraint Programming, Artificial Intelligence, and Operations Research",
year="2025",
publisher="Springer Nature Switzerland",
address="Cham",
pages="35--50",
isbn="978-3-031-95976-9"
}
@article{Hoen2024MIPDD,
author = {Hoen, Alexander and Kamp, Dominik and Gleixner, Ambros},
title = {MIP-DD: A Delta Debugger for Mixed Integer Programming Solvers},
journal = {INFORMS Journal on Computing},
volume = {38},
number = {2},
pages = {414--423},
year = {2025},
doi = {10.1287/ijoc.2024.0844}
}
@inproceedings{Hoen2024PresolveCert,
author = {Hoen, Alexander and Oertel, Andy and Gleixner, Ambros and Nordstrom, Jakob},
title = {Certifying MIP-based Presolve Reductions for 0-1 Integer Linear Programs},
booktitle = {Integration of Constraint Programming, Artificial Intelligence, and Operations Research (CPAIOR)},
year = {2024},
editor = {Bistra Dilkina},
series = {Lecture Notes in Computer Science},
volume = {14742},
pages = {310--328},
publisher = {Springer},
year = {2024},
doi = {10.1007/978-3-031-60597-0_20}
}
@article{HollyPonientzietz2025Clique,
author = {von Holly-Ponientzietz, Jacob and Hoen, Alexander and Turner, Mark and Gleixner, Ambros},
title = {Clique Probing for Mixed-Integer Programs},
year = {2025},
eprint = {2512.17551},
archivePrefix = {arXiv},
primaryClass = {math.OC},
note = {Under review}
}
@article{Gleixner2023Papilo,
author = {Gleixner, Ambros and Gottwald, Leona and Hoen, Alexander},
title = {PaPILO: a Parallel Presolving Library for Integer and Linear Programming with Multiprecision Support},
journal = {INFORMS Journal on Computing},
year = {2023},
volume = {35},
number = {6},
pages = {1329--1341},
doi = {10.1287/ijoc.2022.0171}
}
@article{Halbig2025Diving,
author = {Halbig, Katrin and Hoen, Alexander and Gleixner, Ambros and Weninger, Dieter},
title = {A diving heuristic for mixed-integer problems with unbounded semi-continuous variables},
journal = {EURO Journal on Computational Optimization},
volume = {13},
year = {2025},
issn = {2192-4406},
pages = {1329--1341},
doi = {10.1016/j.ejco.2025.100107}
}
@inproceedings{Mexi2023Scylla,
author = {Mexi, Gioni and Besancon, Mathieu and Bolusani, Suresh and Chmiela, Antonia and Hoen, Alexander and Gleixner, Ambros},
title = {Scylla: a Matrix-free Fix-propagate-and-project Heuristic for Mixed-integer Optimization},
booktitle= {Operations Research Proceedings 2023},
year= {2025},
publisher= {Springer Nature Switzerland},
address= {Cham},
pages= {65--72},
doi = {10.1007/978-3-031-58405-3_9}
}
@article{Besancon2023SCIP8,
author = {Besancon, Mathieu and Bestuzheva, Ksenia and Chen, Wei-Kun and Chmiela, Antonia and Donkiewicz, Tim and Van Doornmalen, Jasper and Eifler, Leon and Gaul, Oliver and Gamrath, Gerald and Gleixner, Ambros and Gottwald, Leona and Graczyk, Christoph and Halbig, Katrin and Hoen, Alexander and Hojny, Christopher and van Der Hulst, Rolf and Koch, Thorsten and Luebbecke, Marco and Maher, Stephen J and Matter, Frederic and Muehmer, Erik and Mueller, Benjamin and Pfetsch, Marc E and Rehfeldt, Daniel and Schlein, Steffan and Schloesser, Franziska and Serrano, Felipe and Shinano, Yuji and Sofranac, Boro and Turner, Mark and Vigerske, Stefan and Wegscheider, Fabian and Wellner, Philipp and Weninger, Dieter and Witzig, Jakob},
title = {Enabling research through the SCIP optimization suite 8.0},
journal = {ACM Transactions on Mathematical Software},
year = {2023},
volume = {49},
number = {2},
pages = {1--21},
doi = {10.1145/3585516}
}
@misc{Besancon2023SCIP8Conf,
author = {Besancon, Mathieu and Bestuzheva, Ksenia and Chen, Wei-Kun and Chmiela, Antonia and Donkiewicz, Tim and Van Doornmalen, Jasper and Eifler, Leon and Gaul, Oliver and Gamrath, Gerald and Gleixner, Ambros and Gottwald, Leona and Graczyk, Christoph and Halbig, Katrin and Hoen, Alexander and Hojny, Christopher and van Der Hulst, Rolf and Koch, Thorsten and Luebbecke, Marco and Maher, Stephen J and Matter, Frederic and Muehmer, Erik and Mueller, Benjamin and Pfetsch, Marc E and Rehfeldt, Daniel and Schlein, Steffan and Schloesser, Franziska and Serrano, Felipe and Shinano, Yuji and Sofranac, Boro and Turner, Mark and Vigerske, Stefan and Wegscheider, Fabian and Wellner, Philipp and Weninger, Dieter and Witzig, Jakob},
title = {SCIP8: rethinking nonlinear constraint representation and recent progress},
howpublished = {23ème congrès annuel de la Société Française de Recherche Opérationnelle et d'Aide à la Décision},
year = {2023},
note = {HAL: hal-03595412}
}
@misc{tjusila2026chap,
title = {CHAP: A Hybrid GPU-CPU Heuristic for MIP},
author = {Gennesaret Kharistio Tjusila and Alexander Hoen and Nils-Christian Kempke and Gioni Mexi and Timo Berthold and Ambros Gleixner and Thorsten Koch and Sebastian Pokutta},
year = {2026},
eprint = {2605.05086},
archivePrefix= {arXiv},
primaryClass = {math.OC},
url = {https://arxiv.org/abs/2605.05086}
}
@misc{mexi2025pbscip,
title = {State-of-the-art Methods for Pseudo-Boolean Solving with SCIP},
author = {Gioni Mexi and Dominik Kamp and Yuji Shinano and Shanwen Pu and Alexander Hoen and Ksenia Bestuzheva and Christopher Hojny and Matthias Walter and Marc E. Pfetsch and Sebastian Pokutta and Thorsten Koch},
year = {2025},
eprint = {2501.03390},
archivePrefix= {arXiv},
primaryClass = {math.OC},
url = {https://arxiv.org/abs/2501.03390}
}
@misc{scip10_2025,
title = {The SCIP Optimization Suite 10.0},
author = {Christopher Hojny and Mathieu Besan{\c{c}}on and Ksenia Bestuzheva and Sander Borst and Jo{\~a}o Dion{\'i}sio and Johannes Ehls and Leon Eifler and Mohammed Ghannam and Ambros Gleixner and Adrian G{\"o}{\ss} and Alexander Hoen and Jacob von Holly-Ponientzietz and Rolf van der Hulst and Dominik Kamp and Thorsten Koch and Kevin Kofler and Jurgen Lentz and Marco L{\"u}bbecke and Stephen J. Maher and Paul Matti Meinhold and Gioni Mexi and Til Mohr and Erik M{\"u}hmer and Krunal Kishor Patel and Marc E. Pfetsch and Sebastian Pokutta and Chantal Reinartz Groba and Felipe Serrano and Yuji Shinano and Mark Turner and Stefan Vigerske and Matthias Walter and Dieter Weninger and Liding Xu},
year = {2025},
eprint = {2511.18580},
archivePrefix= {arXiv},
url = {https://arxiv.org/abs/2511.18580}
}
@misc{scip9_2024,
title = {The SCIP Optimization Suite 9.0},
author = {Suresh Bolusani and Mathieu Besan{\c{c}}on and Ksenia Bestuzheva and Antonia Chmiela and Jo{\~a}o Dion{\'i}sio and Tim Donkiewicz and Jasper van Doornmalen and Leon Eifler and Mohammed Ghannam and Ambros Gleixner and Christoph Graczyk and Katrin Halbig and Ivo Hedtke and Alexander Hoen and Christopher Hojny and Rolf van der Hulst and Dominik Kamp and Thorsten Koch and Kevin Kofler and Jurgen Lentz and Julian Manns and Gioni Mexi and Erik M{\"u}hmer and Marc E. Pfetsch and Franziska Schl{\"o}sser and Felipe Serrano and Yuji Shinano and Mark Turner and Stefan Vigerske and Dieter Weninger and Lixing Xu},
year = {2024},
eprint = {2402.17702},
archivePrefix= {arXiv},
url = {https://arxiv.org/abs/2402.17702}
}
@misc{scip8_2021,
title = {The SCIP Optimization Suite 8.0},
author = {Ksenia Bestuzheva and Mathieu Besan{\c{c}}on and Wei-Kun Chen and Antonia Chmiela and Tim Donkiewicz and Jasper van Doornmalen and Leon Eifler and Oliver Gaul and Gerald Gamrath and Ambros Gleixner and Leona Gottwald and Christoph Graczyk and Katrin Halbig and Alexander Hoen and Christopher Hojny and Rolf van der Hulst and Thorsten Koch and Marco L{\"u}bbecke and Stephen J. Maher and Frederic Matter and Erik M{\"u}hmer and Benjamin M{\"u}ller and Marc E. Pfetsch and Daniel Rehfeldt and Steffan Schlein and Franziska Schl{\"o}sser and Felipe Serrano and Yuji Shinano and Boro Sofranac and Mark Turner and Stefan Vigerske and Fabian Wegscheider and Philipp Wellner and Dieter Weninger and Jakob Witzig},
year = {2021},
eprint = {2112.08872},
archivePrefix= {arXiv},
url = {https://arxiv.org/abs/2112.08872}
}
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