Ciprian Foias

Ciprian Ilie Foiaș (20 July 1933 – 22 March 2020) was a Romanian mathematician. He was awarded the Norbert Wiener Prize in Applied Mathematics in 1995, for his contributions in operator theory.

Ciprian Foias
Ciprian Foias.jpg
Ciprian Ilie Foiaș

(1933-07-20)20 July 1933
Died22 March 2020(2020-03-22) (aged 86)
Alma materUniversity of Bucharest
AwardsWiener Prize (1995)
Scientific career
InstitutionsIndiana University
University of Bucharest
Doctoral advisorMiron Nicolescu
Doctoral studentsZoia Ceaușescu
Adrian Ocneanu
Dan-Virgil Voiculescu

Education and careerEdit

Born in Reșița, Romania, Foias received his doctorate from the University of Bucharest in 1962, under supervision of Miron Nicolescu. He taught at his alma mater (1966–1979), Paris-Sud 11 University (1979–1983), and Indiana University (1983 until retirement). Beginning in 2000, he was a teacher and researcher at Texas A&M University, where he was a Distinguished Professor.

The Foias constant is named after him. Foias is listed as an ISI highly cited researcher.[1]

Together with Sz-Nagy, Foias proved the celebrated Commutant lifting theorem.

He died in Tempe, Arizona on March 22, 2020.[2]


  • with Béla Szőkefalvi-Nagy: Harmonic analysis of operators on Hilbert Space. North Holland 1970 (Translated from the French; first edition: Masson 1967). MR0275190
  • with Roger Temam, Oscar Manley, and Ricardo Rosa: Navier Stokes equations and Turbulence. Cambridge University Press, 2001.
  • with Peter Constantin, Roger Temam: Attractors representing turbulent flows. American Mathematical Society, 1985.
  • with Peter Constantin: Navier Stokes Equations. University of Chicago Press, 1988.
  • with Hitay Özbay, Allen Tannenbaum: Robust control of infinite dimensional systems. Springer, 1995.
  • with Hari Bercovici, Carl Pearcy: Dual algebras with applications to invariant subspaces and dilation theory. American Mathematical Society, 1985.
  • with Ion Colojoară: Theory of generalized spectral operators. Gordon and Breach, 1968.
  • with Peter Constantin, Roger Temam, and Basil Nicolaenko: Integral Manifolds and Inertial Manifolds for Dissipative Partial Differential Equations. Springer-Verlag, Applied Mathematical Sciences Series, volume 70, 1988.

See alsoEdit


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