Themistocles M. Rassias

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Themistocles M. Rassias
Rassias around 2005
Born (1951-04-02) April 2, 1951 (age 64)
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][4]
Influences Stephen Smale,
Stanislaw Ulam
Notable awards Doctor Honoris Causa, University of Alba Iulia,[5] Romania (2008)

Honorary Doctorate, University of Nis,[6] Serbia (2010)

Themistocles M. Rassias (Greek: Θεμιστοκλής Μ. Ρασσιάς; born on 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 250 papers, 7 research books and 30 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 by several mathematicians. 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, Global Analysis, 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).

Mathematical Terminology[edit]

Some of his research work has been established with the scientific terminology:

(i) Hyers–Ulam–Rassias stability[1][2] of functional equations. (ii) The Aleksandrov–Rassias problem[3][4] for isometric mappings.[7]

Awards and honors[edit]

He has received a number of honors and awards including:

See also[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).


  1. ^ a b Jung, Soon-Mo (2011). Hyers–Ulam–Rassias Stability of Functional Equations in Nonlinear Analysis. New York, USA: Springer. p. 377. ISBN 978-1-4419-9636-7. 
  2. ^ a b "Hyers-Ulam-Rassias stability" (PDF). 
  3. ^ a b "On the Aleksandrov-Rassias problem for isometric mappings" (PDF). 
  4. ^ a b "On the Aleksandrov-Rassias problem and the geometric invariance in Hilbert spaces" (PDF). 
  5. ^ "University of Alba Iulia". 
  6. ^ "University of Nis". 
  7. ^ An interview with Themistocles M. Rassias

External links[edit]