Christoph Spiegel
deputy department head at ZIB since 2022postdoctoral researcher at ZIB since August 2020
📬 Contact
office  Room 3036 at
ZIB Room MA 607 at TUB 

spiegel (at) zib.de spiegel (at) campus.tuberlin.de 

homepage  christophspiegel.berlin 
languages  German, English, and French 
🎓 Academic Background
Jun 2020  Ph.D. in Applied Mathematics at UPC 

Mar 2015  M.Sc. in Mathematics at FUB 
Dec 2012  B.Sc. in Mathematics at FUB 
🔬 Research
Preprints
 Zimmer, M., Spiegel, C., and Pokutta, S. (2023). Sparse Model Soups: A Recipe for Improved Pruning Via Model Averaging.
[arXiv]
[BibTeX]
 Zimmer, M., Spiegel, C., and Pokutta, S. (2022). Compressionaware Training of Neural Networks Using FrankWolfe.
[arXiv]
[BibTeX]
 Combettes, C., Spiegel, C., and Pokutta, S. (2020). Projectionfree Adaptive Gradients for Largescale Optimization.
[arXiv]
[summary]
[code]
[BibTeX]
 Pokutta, S., Spiegel, C., and Zimmer, M. (2020). Deep Neural Network Training with FrankWolfe.
[arXiv]
[summary]
[code]
[BibTeX]
 Salia, N., Spiegel, C., Tompkins, C., and Zamora, O. (2019). Independent Chains in Acyclic Posets.
[arXiv]
[BibTeX]
Conference proceedings
 Parczyk, O., Pokutta, S., Spiegel, C., and Szabó, T. (2023). Fully Computerassisted Proofs in Extremal Combinatorics. Proceedings of AAAI Conference on Artificial Intelligence.
[arXiv]
[slides]
[code]
[BibTeX]
 Rué Perna, J. J., and Spiegel, C. (2023). The Rado Multiplicity Problem in Vector Spaces Over Finite Fields. Proceedings of European Conference on Combinatorics.
[arXiv]
[code]
[BibTeX]
 Zimmer, M., Spiegel, C., and Pokutta, S. (2023). How I Learned to Stop Worrying and Love Retraining. Proceedings of International Conference on Learning Representations.
[arXiv]
[code]
[BibTeX]
 Parczyk, O., Pokutta, S., Spiegel, C., and Szabó, T. (2022). New Ramsey Multiplicity Bounds and Search Heuristics. Proceedings of Discrete Mathematics Days.
[arXiv]
[code]
[BibTeX]
 Rué Perna, J. J., and Spiegel, C. (2018). On a Problem of Sárközy and Sós for Multivariate Linear Forms. Proceedings of Discrete Mathematics Days.
[arXiv]
[BibTeX]
 Kusch, C., Rué Perna, J. J., Spiegel, C., and Szabó, T. (2017). Random Strategies Are Nearly Optimal for Generalized Van Der Waerden Games. Proceedings of European Conference on Combinatorics.
[URL]
[arXiv]
[BibTeX]
Full articles
 Kamčev, N., and Spiegel, C. (2022). Another Note on Intervals in the HalesJewett Theorem. Electronic Journal of Combinatorics, 29(1).
DOI: 10.37236/9400
[URL]
[arXiv]
[BibTeX]
 CaoLabora, G., Rué Perna, J. J., and Spiegel, C. (202110). An ErdősFuchs Theorem for Ordered Representation Functions. Ramanujan Journal, 56, 183–2091.
DOI: 10.1007/s11139020003262
[URL]
[arXiv]
[BibTeX]
 Fabian, D., Rué Perna, J. J., and Spiegel, C. (202108). On Strong Infinite Sidon and Bₕ Sets and Random Sets of Integers. Journal of Combinatorial Theory, Series A, 182.
DOI: 10.1016/j.jcta.2021.105460
[URL]
[arXiv]
[BibTeX]
 Corsten, J., Mond, A., Pokrovskiy, A., Spiegel, C., and Szabó, T. (202010). On the Odd Cycle Game and Connected Rules. European Journal of Combinatorics, 89.
DOI: 10.1016/j.ejc.2020.103140
[URL]
[arXiv]
[BibTeX]
 Candela, P., Serra, O., and Spiegel, C. (2020). A Step Beyond Freĭman’s Theorem for Set Addition Modulo a Prime. Journal De Théorie Des Nombres De Bordeaux, 32(1), 275–289.
DOI: 10.5802/jtnb.1122
[URL]
[arXiv]
[BibTeX]
 Rué Perna, J. J., and Spiegel, C. (2020). On a Problem of Sárközy and Sós for Multivariate Linear Forms. Revista Matemática Iberoamericana, 36(7), 2107–2119.
DOI: 10.4171/RMI/1193
[URL]
[arXiv]
[BibTeX]
 Kusch, C., Rué Perna, J. J., Spiegel, C., and Szabó, T. (201909). On the Optimality of the Uniform Random Strategy. Random Structures & Algorithms, 55(2), 371–401.
DOI: 10.1002/rsa.20829
[URL]
[arXiv]
[BibTeX]
 Freĭman, G. A., Serra, O., and Spiegel, C. (2019). Additive Volume of Sets Contained in Few Arithmetic Progressions. INTEGERS, 19.
[URL]
[arXiv]
[BibTeX]
 Rué Perna, J. J., Spiegel, C., and Zumalacárregui, A. (2018). Threshold Functions and Poisson Convergence for Systems of Equations in Random Sets. Mathematische Zeitschrift, 288, 333–360.
DOI: 10.1007/s0020901718912
[URL]
[arXiv]
[BibTeX]
 Spiegel, C. (2017). A Note on Sparse Supersaturation and Extremal Results for Linear Homogeneous Systems. Electronic Journal of Combinatorics, 24(3).
DOI: 10.37236/6730
[URL]
[arXiv]
[BibTeX]
💬 Talks and posters
Conference and workshop talks
 Aug 2023
 European Conference on Combinatorics, Prague [PDF]
 Aug 2023
 ICIAM 2023 Minisymposium: Advances in Optimization I, Tokyo [PDF]
 Aug 2023
 Conference on Discrete Optimization and Machine Learning, Tokyo [PDF]
 Jun 2023
 FoCM 2023 Workshop I.3: Graph Theory and Combinatorics, Paris [PDF]
 May 2023
 Combinatorial and Additive Number Theory Conference, New York [PDF]
View More / Less
 Mar 2023
 Workshop on Optimization and Machine Learning, Waischenfeld [PDF]
 Feb 2023
 AAAI Conference on Artificial Intelligence, Washington, DC [PDF]
 Dec 2022
 Workshop on Recent Advances in Optimization, Toronto [PDF]
 Sep 2022
 Workshop on Advances in Classical and Quantum Algorithms ..., Tokyo / Fukuoka [PDF]
 Jul 2022
 Discrete Mathematics Days, Santander [PDF]
 Jun 2019
 Postgraduate Combinatorial Conference, Oxford [PDF]
 Jun 2019
 GAPCOMB Workshop, Campelles
 Jun 2018
 Discrete Mathematics Days, Sevilla [PDF]
 May 2018
 Combinatorial and Additive Number Theory Conference, New York [PDF]
 Sep 2017
 The Music of Numbers, Madrid [PDF]
 Jun 2017
 Interactions with Combinatorics [PDF]
 Mar 2017
 FUBTAU Workshop
Research seminar talks
 Feb 2023
 LIMDA Seminar, Barcelona [PDF]
 Apr 2022
 LIMDA Seminar, Barcelona
 Nov 2019
 Research Seminar Combinatorics, Berlin
 Nov 2019
 Combinatorics Research Seminar, Ilmenau
 May 2019
 PhD Seminar on Combinatorics, Games and Optimisation, London
View More / Less
 May 2019
 Combinatorial Theory Seminar, Oxford
 Feb 2019
 Extremal Set Theory Seminar, Budapest
 Dec 2018
 Research Seminar Combinatorics, Berlin
 Mar 2018
 GRAPHS at IMPA, Rio de Janeiro
 Dec 2017
 Research Seminar Combinatorics, Berlin
 Oct 2017
 LIMDA Seminar, Barcelona
 May 2017
 LIMDA Seminar, Barcelona
 Mar 2016
 LIMDA Seminar, Barcelona
 Feb 2016
 Research Seminar Combinatorics, Berlin
 Jan 2016
 Research Seminar Combinatorics, Berlin
 Dec 2015
 "What Is ...?" Seminar
 Oct 2015
 Research Seminar Combinatorics, Berlin
👨🏫 Teaching
 winter 2023
 Lecturer for Einführung in die Lineare und Kombinatorische Optimierung (ADM I) at TUB
 summer 2023
 Lecturer for Analysis I und Lineare Algebra für Ingenieurwissenschaften at TUB
 autumn 2018
 Assistant for Discrete Mathematics and Optimization at UPF
 autumn 2017
 Assistant for Discrete Mathematics and Optimization at UPF
 winter 2013
 Tutor for Analysis I (Lehramt) at FUB
 summer 2012
 Tutor for Analysis II (Lehramt) at FUB
 summer 2011
 Tutor for Analysis I (Lehramt) at FUB
📝 Organization
 2023
 Member of the organising committee of the MATH+ Thematic Einstein Semester in Berlin
 Nov 2022
 Assisted in the organisation of the Festkolloquium for Martin Aigner in Berlin
 2022
 Member of the organising committee of a Girls’ Day science outreach event in Berlin
 Sep 2021
 Member of the organising committee of the EUROCOMB conference in Barcelona
 2021
 Member of the organising committee of a Girls’ Day science outreach event in Berlin
 Sep 2020
 Organised exercise session on Robust Machine Learning for CO@Work summer school in Berlin
 Oct 2017
 Member of the organising committee of the BMSBGSMath Junior Meeting in Barcelona
 Jul 2016
 Assisted in the organisation of the Symposium Diskrete Mathematik in Berlin
 Jun 2016
 Assisted in the organisation of the Discrete Mathematics Days in Barcelona