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Stef Tijs (August 31, 1937 – June 13, 2023), or Stephanus Hendrikus Tjis^[1] was a Dutch mathematician and a game theory pioneer in the Netherlands.^[2]^[3] He contributed to most subfields in game theory and particularly in cooperative game theory, where he introduced the Tijs value (later known as the τ value) in 1981 as a solution to n-person games alternative to the Shapley value and others.^[4]^[5]^[6]

Education and career

Tijs was born in Ginneken en Bavel.^[1] He studied at Utrecht University for a bachelor's degree in chemistry from 1954 to 1959, later he switched to mathematics, obtaining a MSc degree at the same university in 1963. Tijs was a research assistant in mathematics at Radboud University Nijmegen from 1963 to 1969 and an assistant professor in mathematics there from 1969. He received his PhD in mathematics for work on matrix games from the Radboud University Nijmegen under the supervision of Arnoud van Rooij and Freddy Delbaen (who was younger than Tijs) in 1975.^[7] He became an associate professor at Nijmegen in 1975 and gradually built up a Dutch school of game theory there with an international outlook. In 1982, Tijs initiated the game theory seminar in Nijmegen, which later prompted the Netherlands to join the European Meeting on Game Theory (also called SING) that is held annually from 2000.^[8] Tijs was promoted to full professor at Radboud University Nijmegen in 1985. In 1991, he moved to Tilburg University, where he became a professor at the Department of Econometrics and Operations Research and the Center of Economic Research. He stayed for the remainder of his career. Between 2003 and 2005, Tijs was also a professor of mathematics at University of Genoa in Italy.^[9]^[3]

Tijs received a honorary doctorate from the Miguel Hernández University of Elche in 2000.^[10] He was a fellow and a council member of the Game Theory Society.^[11] He became a Knight of the Order of the Netherlands Lion in 2003.^[3]

Bibliography

Patrone, Fioravante; García-Jurado, Ignacio; Tijs, Stef, eds. (2000). Game Practice: Contributions from Applied Game Theory. Theory and Decision Library. Vol. 23. Boston, MA: Springer US. doi:10.1007/978-1-4615-4627-6. ISBN 978-1-4613-7092-5.
Tijs, Stef (2003). Introduction to Game Theory. Texts and Readings in Mathematics. Gurgaon: Hindustan Book Agency. doi:10.1007/978-93-86279-17-0. ISBN 978-81-85931-37-1.
Branzei, Rodica; Dimitrov, Dinko; Tijs, Stef (2008). Models in Cooperative Game Theory. Berlin, Heidelberg: Springer Berlin Heidelberg. doi:10.1007/978-3-540-77954-4. ISBN 978-3-540-77953-7.

References

^ ^a ^b "Stef (Stephanus Hendrikus) Tijs ✝ 13-06-2023 overlijdensbericht en condoleances - Mensenlinq.nl". Mensenlinq (in Dutch).
^ "On Stef Tijs". International Journal of Game Theory. 33 (3): 379–380. September 2005. doi:10.1007/s00182-005-0214-8.
^ ^a ^b ^c Borm, Peter; Peters, Hans (December 2023). "Professor Stef Tijs (1937–2023)". International Journal of Game Theory. 52 (4): 953–955. doi:10.1007/s00182-023-00876-x.
^ Tijs, S. (1981), Moeschlin, O.; Pallaschke, D. (eds.), "Bounds for the core of a game and the t-value", Game Theory and Mathematical Economics, Amsterdam: North-Holland Publishing Company, pp. 123–132, ISBN 978-0-444-86296-9, retrieved 2024-06-30
^ Tijs, Stef (2003), "The τ-value", Introduction to Game Theory, Texts and Readings in Mathematics, Gurgaon: Hindustan Book Agency, pp. 96–101, doi:10.1007/978-93-86279-17-0_15, ISBN 978-81-85931-37-1, retrieved 2024-06-30
^ Müller, David (2019), "Kooperative Spieltheorie und Gemeinschaftsinvestitionen", Investitionsrechnung und Investitionscontrolling, Springer-Lehrbuch (in German), Berlin, Heidelberg: Springer Berlin Heidelberg, pp. 463–589, doi:10.1007/978-3-662-57609-0_6, ISBN 978-3-662-57608-3, retrieved 2024-06-30
^ Tijs, S.H. (1975). Semi-infinite and infinite matrix games and bimatrix games.
^ Gambarelli, Gianfranco (2011). "APPENDIX: A history of the SING Conference". Operations Research and Decisions. 21 (3–4): 69–71.
^ "[PDF] C.V. Stef Tijs". silo.tips. Retrieved 2024-06-30.
^ "Stephanus Hendrikus Tijs, Doctor Honoris Causa por la UMH (27 de septiembre de 2000) | Memoria digital de Elche/Elx". www.elche.me (in Spanish). Retrieved 2024-06-30.
^ "Organization – Game Theory Society". Retrieved 2024-06-30.