Institute of Information Technologies

Zafeirakis Zafeirakopoulos Asst.Prof. Zafeirakis Zafeirakopoulos
Tel (262) 605 24 12
E-mail zafeirakopoulos {at} gtu.edu.tr
Office Block A2, 242
Research Interests Linear Diophantine Systems, Partition Analysis, Integer Linear Optimization, Algebraic Combinatorics, Enumerative Combinatorics, Polyhedral Geometry, Orthogonal Designs, Gröbner bases, Symbolic Computation, Algorithms

Refereed Publications

[A1] Angelos Mantzaflaris, Hamid Rahkooy, and Zafeirakis Zafeirakopoulos. “Efficient computation of dual space and directional multiplicity of an isolated point”. In Computer Aided Geometric Design (2016). URL

[A2] M. Beck, B. Braun, M. Köppe, C. D. Savage, and Z. Zafeirakopoulos. “Generating functions and triangulations for lecture hall cones”. In: SIAM Discrete Mathematics (2016). URL

[A3] Ioannis Z. Emiris, Christos Konaxis, and Zafeirakis Zafeirakopoulos. “Minkowski Decomposition and Geometric Predicates in Sparse Implicitization”. In: Proceedings of the 40th International Symposium on Symbolic and Algebraic Computation. ISSAC ’15. Bath, UK, 2015. URL

[A4] Matthias Beck, Benjamin Braun, Matthias Köppe, Carla D. Savage, and Zafeirakis Zafeirakopoulos. “s-Lecture hall partitions, self-reciprocal polynomials, and Gorenstein cones”. English. In: The Ramanujan Journal (2014), pp. 1–25. issn: 1382-4090. doi: 10.1007/s11139-013-9538-3. URL.

[A5] Christos Koukouvinos, Veronika Pillwein, Dimitris E. Simos, and Zafeirakis Zafeirakopoulos. “On the average complexity for the verification of compatible sequences”. In: Information Processing Letters 111.17 (2011), pp. 825–830. issn: 0020-0190. doi: DOI:10.1016/j.ipl.2011.05.015. URL.

[A6] Michael Hemmer, Elias P. Tsigaridas, Zafeirakis Zafeirakopoulos, Ioannis Z. Emiris, Menelaos I. Karavelas, and Bernard Mourrain. “Experimental evaluation and cross-benchmarking of univariate real solvers”. In: Proceedings of the 2009 conference on Symbolic numeric computation. SNC ’09. Kyoto, Japan: ACM, 2009, pp. 45–54. isbn: 978-1-60558-664-9. doi: 10.1145/1577190.1577202. URL.

Preprints and Submitted

[S1] Felix Breuer and Zafeirakis Zafeirakopoulos. “Polyhedral Omega: A New Algorithm for Solving Linear Diophantine Systems”. In: ArXiv e-prints arXiv:1501.07773 (Jan. 2015). arXiv: 1501 . 07773 [math.CO].

Conference Posters and Presentations

[C1] Christos Koukouvinos, Dimitris E Simos, and Zafeirakis Zafeirakopoulos. “A Gr¨obner Bases Method for Complementary Sequences”. In: Proceedings of Applications of Computer Algebra ACA 2013. M´alaga (2013), p. 255.

[C2] Felix Breuer and Zafeirakis Zafeirakopoulos. “Partition Analysis via Polyhedral Geometry”. In: ACM Commun. Comput. Algebra 46.3 (2012), pp. 76–77. issn: 1932-2240.

[C3] Zafeirakis Zafeirakopoulos. Partition Analysis and Polyhedral Geometry. MAA Golden Section poster. 2012.

[C4] Christos Koukouvinos, Dimitris E. Simos, and Zafeirakis Zafeirakopoulos. “An algebraic framework for extending orthogonal designs”. In: ACM Commun. Comput. Algebra 45.1/2 (July 2011), pp. 123–124. issn: 1932-2240. doi: 10.1145/2016567.2016587. url: http://doi.acm.org/10. 1145/2016567.2016587.

[C5] Hamid Rahkooy and Zafeirakis Zafeirakopoulos. “Using resultants for inductive Gr¨obner bases computation”. In: ACM Commun. Comput. Algebra 45.1/2 (July 2011), pp. 135–136. issn: 1932- 2240. doi: 10.1145/2016567.2016593. url: http://doi.acm.org/10.1145/2016567.2016593.

Theses and Technical Reports

[TR1] Christos Koukouvinos, Veronika Pillwein, Dimitris E. Simos, and Zafeirakis Zafeirakopoulos. A Note on the Average Complexity Analysis of the Computation of Periodic and Aperiodic Ternary Complementary Pairs. Research Report DK-2010-08. Doctoral Program Computational Mathematics, Oct. 2010. url: https://www.dk- compmath.jku.at/dk- reports/dk- report- 10- 08/at_download/file.

[TR2] Ioannis Emiris, Michael Hemmer, Menelaos Karavelas, Sebastian Limbach, Bernard Mourrain, Elias P. Tsigaridas, and Zafeirakis Zafeirakopoulos. Cross-benchmarks of univariate algebraic kernels. Tech. rep. ACS-TR-363602-02. INRIA, MPI, and NUA, 2008.

[T1] Zafeirakis Zafeirakopoulos. “Linear Diophantine Systems: Partition Analysis and Polyhedral Geometry”. PhD thesis. Johannes Kepler University, Dec. 2012.

[T2] Zafeirakis Zafeirakopoulos. “Study and Benchmarks for Real Root Isolation methods”. MA thesis. Departments of Informatics and Telecommunication, Dec. 2008.


  • Doctor in Technical Sciences, Johannes Kepler University – Research Institute for Symbolic Computation (RISC), 2012
  • Master in Computational Science, University of Athens, 2008
  • Bachelor in Mathematics, University of Athens, 2005