Themistocles M. Rassias

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Themistocles M. Rassias
Rassias around 2005
Born (1951-04-02) April 2, 1951 (age 66)
Pellana, Peloponnese, Greece
Residence Greece
Nationality Greek
Fields Mathematics
Institutions National Technical University of Athens
Alma mater University of California, Berkeley (Ph.D.)
Doctoral advisor Stephen Smale
Known for Hyers–Ulam–Rassias stability[1][2]
Aleksandrov–Rassias problem[3]
Influences Stephen Smale,
Stanislaw Ulam
Notable awards Doctor Honoris Causa, University of Alba Iulia, Romania (2008)

Honorary Doctorate, University of Nis,[4] Serbia (2010)

Doctor Honoris Causa, Valahia University of Targoviste, Romania (2016)

Themistocles M. Rassias (Greek: Θεμιστοκλής Μ. Ρασσιάς; born April 2, 1951) is a Greek mathematician, and a Professor at the National Technical University of Athens (Eθνικό Μετσόβιο Πολυτεχνείο), Greece. He has published more than 290 papers, 9 research books and 40 edited volumes in research Mathematics as well as 4 textbooks in Mathematics (in Greek) for university students. His research work has received a large number of citations[5] by several mathematicians.[6] He serves as a member of the Editorial Board of several international mathematical journals.


He received his Ph.D. in Mathematics from the University of California at Berkeley in June 1976. Professor Stephen Smale and Professor Shiing-Shen Chern have been his thesis and academic advisors, respectively.


His work extends over several fields of Mathematical Analysis. It includes Nonlinear Functional Analysis, Functional Equations, Approximation Theory, Analysis on Manifolds, Calculus of Variations, Inequalities, Metric Geometry and their Applications.

He has contributed a number of results in the stability of minimal submanifolds, in the solution of Ulam's Problem for approximate homomorphisms in Banach spaces, in the theory of isometric mappings in metric spaces and in Complex analysis (Poincaré's inequality and harmonic mappings).


(i) Hyers–Ulam–Rassias stability of functional equations.

(ii) The Aleksandrov–Rassias problem[3] for isometric mappings.[7]

Awards and honors[edit]

He has received a number of honors and awards including:


  • Th. M. Rassias, On the stability of the linear mapping in Banach spaces, Proceedings of the American Mathematical Society 72(1978), 297-300. [Translated in Chinese and published in: Mathematical Advance in Translation, Chinese Academy of Sciences 4 (2009), 382-384.]
  • Th. M. Rassias, New characterizations of inner product spaces, Bulletin des Sciences Mathematiques, 108 (1984), 95-99.
  • Th. M. Rassias, On the stability of functional equations and a problem of Ulam, Acta Applicandae Mathematicae 62(1) (2000), 23-130.
  • Th. M. Rassias, Major trends in Mathematics, Newsletter European Math. Soc. 62 (2006), 13-14. Translated in Chinese and published in:Mathematical Advance in Translation, Chinese Academy of Sciences 2 (2008), 172-174.
  • Th. M. Rassias and J. Brzdek, Functional Equations in Mathematical Analysis, Springer, New York, 2012.
  • Th. M. Rassias and J. Simsa, Finite Sums Decompositions in Mathematical Analysis, John Wiley & Sons Ltd. (Wiley-Interscience Series in Pure and Applied Mathematics), Chichester, New York, Brisbane, Toronto, Singapore, 1995.



Further reading[edit]

  • Hyers-Ulam-Rassias stability, in: Encyclopaedia of Mathematics, Supplement III Hazewinkel, M. (ed.), Kluwer (2001) ISBN 1-4020-0198-3, pp. 194–196.
  • Ulam-Hyers-Rassias Stability of Functional Equations, in: S. Czerwik, Functional Equations and Inequalities in Several Variables (Part II, pp. 129–260).

External links[edit]