Research

Interests Link to heading

  • Infinite-dimensional differential-algebraic equations (short DAEs).
  • Index of DAEs.
  • Solvability and solution representations of DAEs.
  • Port-Hamiltonian DAEs

Research Stays Link to heading

University of Waterloo, Ontario, Canada, Oct 2023 - Dec 2023
This stay was supervised by Prof. Dr. Kirsten Morris. This stay was partly funded by the NSERC (Canada).
Contributed talk: Weierstraß form and port-Hamiltonian DAEs.

Preprints Link to heading

M. Erbay, B. Jacob, T. Reis, Differential algebraic system nodes, arXiV:2511.17035, 2025.
M. Erbay, B. Jacob, T. Reis, Integrated Semigroups for abstract differential-algebraic equations, arXiV:2509.02814, 2025.

Published Link to heading

M. Erbay, B. Jacob, K. Morris, On the weierstraß form of infinite dimensional differential algebraic equations, Journal of Evolution Equations, 24 (73), 2024.
M. Erbay, B. Jacob, K. Morris, T. Reis, C. Tischendorf, Index Concepts for Linear Differential-Algebraic Equations in Infinite Dimensions, DAE Panel, 2, 2024.

Research Programs Link to heading

Participated Conferences and Given Presentations Link to heading

Date Conference and contribution
11.2025 1st IRTG Workshop - CRC 1701 Port-Hamiltonian Systems, Wuppertal, Germany
Contributed Poster: A port-Hamiltonian differential algebraic system node approach
10.2025 Doctoral College: “Port-Hamiltonian Systems: Modeling, Numerics and Control, Groningen, Netherlands
09.2025 1st Annual Retreat - CRC 1701 Port-Hamiltonian Systems, Balve, Germany
Contributed Talk: A01: Infinite-dimensional differential-algebraic pHS - together with A. Fischer, B. Jacob, T. Reis
07.2025 SIAM Conference on Control and Its Applications (CT 25), Montreal, Canada
Contributed Talk: Tutorial on Differential Algebraic Equation - together with A. Alalabi, H. Gernandt
Contributed Talk: Integrated Semigroups for abstract dissipative-Hamiltonian DAEs
03.2025 Spring School on Theory and Application of Port-Hamiltonian Systems 2025, Fraueninsel, Chiemsee, Germany
Contributed Poster: Integrated semigroups and a port-Hamiltonian differential-algebraic system node approach
03.2025 10th Workshop on Differential-Algebraic Equations - Descriptor 2025, Paderborn, Germany
Contributed Talk: Integrated Semigroups and a Differential-Algebraic System Node Apporach
12.2024 1st Port-Hamiltonian Symposium, Wuppertal, Germany
Project Organization: Dissipative Hamiltonian DAEs in infinite dimensions
10.2024 Doctoral College: “Port-Hamiltonian Systems: Modeling, Numerics and Control, Twente, Netherlands
08.2024 26th International Symposium on Mathematical Theory of Networks and Systems, Cambridge, United Kingdom
Contributed Talk: On the Weierstraß form of infinite dimensional differential algebraic equations
05.2024 GAMM Activity Group Applied Operator Theory and the Bremen-Hamburg-Kiel-Oldenburg Seminar, Hamburg, German
Contributed Talk: Solvability of infinite-dimensional port-Hamiltonian DAEs
03.2024 Doctoral College: “Port-Hamiltonian Systems: Modeling, Numerics and Control, Toulouse, France
Contribted Talk: Solvability of infinite-dimensional port-Hamiltonian DAEs
04.2023 Differential-Algebraic Equations and Operator Pencils Workshop, Banff, Canada
03.2023 Doctoral College: “Port-Hamiltonian Systems: Modeling, Numerics and Control, Wuppertal, Germany
Contributed Talk: Infinite-dimensional port-Hamiltonian DAEs
11.2022 Doctoral College: “Port-Hamiltonian Systems: Modeling, Numerics and Control, Besançon, France
06.2022 25th Internet Seminar: Spectral Theory for Operators and Semigroups, Salerno, Italy
Contributed Project: Semi-uniform Stability for Bounded Semigroups
03.2022 Spring School on Theory and Applications of Port-Hamiltonian Systems 2022 Fraueninsel, Chiemsee, Germany
11.2021 Mathematical Seminar, Alfréd Rényi Institute of Mathematic, Budapest, Hungary
Contributed Talk: Discrete Approximation of Unbounded Operators and Approximation of their Spectra
08.2021 International Workshop on Operator Theory and its Applications, Lancaster, United Kingdom (online due to Covid)
07.2021 24th Internet Seminar: C∗-algebras and dynamics (online due to Covid)
Contributed Project: The Calkin algebra
07.2020 23th Internet Seminar: Evolutionary Equations, Wuppertal, Germany (online due to Covid)
Contributed Project: Semigroups and Evolutionary Equations