Ciprian Foias

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Ciprian Foias
Ciprian Foias.jpg
Ciprian Foias in Tokyo 1969
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

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

Education and career[edit]

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.

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