# **Recent Papers**

The links refers to preprints at math arXiv. All my papers on arXiv can be found

* here**
Published versions may be different. In some cases the files
are missing due to copyright restrictions. Please write me if you want
to have electronic or hard copies.
** ** (with L. Suciu) ** **Similarity problems, Folner sets and
isometric representations of amenable semigroups *, Preprint*
** (with M. Crouzeix and H. Klaja) ** Spectral sets and operator radii *, Preprint*
** (with S. Grivaux) ** Kazhdan constants, continuous probability measures
with large Fourier coefficients and rigidity sequences *, Preprint*
** (with S. Grivaux) ** Kazhdan sets in groups and equidistribution
properties *, J. Funct. Anal.*
** (with L. Suciu) ** Harnack and Shmul'yan pre-order
relations for Hilbert space contractions *, Preprint.*
** (with D. Seifert) ** Ritt operators and convergence
in the method of alternating projections *, to appear in J. Approx Th.*
** (with L. Suciu, D. Timotin) ** Classes of contractions and Harnack domination *, Preprint.*
** K-spectral sets: an asymptotic viewpoint.*,
J. Appl. Funct. Anal. 9 (2014), no. 3-4, 239--250.
(with B. Beckermann) * Spectral Sets*,
Chapter 37, in Handbook of linear algebra.
Edited by Leslie Hogben.
Chapman and Hall/CRC, 2014.
(with M. Crouzeix) * Numerical radius and distance to unitaries.*,
Operator and Matrices.
(with S. Grivaux and V. Muller) * A generalization of the Friedrichs angle
and the method of
alternating projections*, Comptes Rendus Math. 348(2010), 53-56.
(with S. Grivaux and V. Muller) * The rate of convergence in the method of
alternating projections*, Algebra i Analiz 23 (2011), no. 3, 1--30;
translation in St. Petersburg Math. J. 23 (2012), no. 3, 413--434
(with Yu.I. Lyubich) *Geometric, spectral and asymptotic properties of averaged products
of projections in Banach spaces*, Studia Math.
(with S. Grivaux and V. Muller) *Epsilon-hypercyclic operators*, Ergodic Theory Dynamical
Syst. ; Oberwolfach Preprints.
(with B. Beckermann and M. Crouzeix) *Intersections of several
disks of the Riemann sphere as K-spectral sets*, Preprint ArXiv ; Comm Pure Appl. Math. (P.G. Ciarlet
volume)
*Bernstein Polynomials and Operator Theory*, Results in
Math. (Birkhauser)
(with V. Muller) *On weak orbits of operators*, Topology Appl,
Jan Pelant memorial volume
(with S. Grivaux) *Faber-hypercyclic operators*, Israel J. Math.
(with S. Grivaux) *Size of the peripheral point
spectrum under power or resolvent growth conditions*, J. Funct. Anal.
(with S. Grivaux) *Unimodular eigenvalues,
uniformly distributed sequences and linear dynamics*, Advances in
Math
(with V. Muller) *Subscalar operators and
growth of resolvent*, J. Operator Th.
(with M. Mbekhta) *Operators similar to
partial isometries*, Acta Sci Math
(with V. Muller) *Growth conditions
and inverse producing extensions*, J. Operator Th.
(with M. Crouzeix, B. Delyon) *Convex domains
and K-spectral sets*, Math. Z.
(with V. Muller) *Invertible extensions
and growth conditions *, C.R. Acd. Sci. Paris Ser. I 339(2004),
21-26.
*Operators near
completely polynomially dominated ones and similarity problems*,
J. Operator. Th., 49(2003), 3-23.
*Perturbations of operators similar to contractions and the
commutator equation *, Studia Math. 150(2002), 273-293.
(with G. Cassier) *Constrained von Neumann inequalities*,
Advances in Math. 166(2002), 260-297.
(with V. Paulsen) *Schur
multipliers and operator-valued Foguel-Hankel operators*,
Indiana Univ. Math. J. 50(2001), 1509-1522.
(with M. Mbekhta) *The stability radius of
Fredholm linear pencils*, J. Math. Anal. Appl., 260 (2001), no.
1, 159--172.
Stable
ranks, K-groups and Witt groups of some Banach and C*-algebras,,
Contemporary Math. (A.M.S.), 232(1999), 55-64.
(with M. Mbekhta) *Compressions of
resolvents and maximal radius of regularity*, Trans. Amer. Math.
Soc. 351(1999), 2949-2960.
(with M. Mbekhta) *On existence
of one-sided and generalized resolvents of bounded linear operators*,
in : Proc. International Workshop on Operator Theory, Cefaly, July
1997, (ed. by P. Aiena, M. Pavone and C. Trapani), 139-148, Palermo 1998.
*The
stable rank of topological algebras and a problem of R.G. Swan*,Journal
of Functional Analysis, **160** (1998), 42-78.
*Sur
les caracteres d'une algebre de Banach*, Canad. Math. Bull. **40**
(1997), 129-132.
(with M. Mbekhta) *Generalized
inverses and the maximal radius of regularity of a Fredholm operator*,
Integral Equat. Operator Th. **28** (1997), 133-146.
*On
some criteria of irrationality for series of positive rationals : a
survey*, in Actes ds rencontres Arithmetiques de Caen (a la
memoire de Roger Apery), 2-3 juin 1995, 1-14. ;
(with C. Cottin, H. H. Gonska) *Boegel functions, tensor
products and blending approximation*, Math. Nachr. **173** (1995),
25-48.
*K-functionals and moduli of smoothness of functions defined on
compact metric spaces*, in Concrete Analysis, edited by G.A.
Anastassiou, Academic Press, 1995, pp.23-31.
*Banach algebras with the same K-theory and the same stable rank*,
IMRN - Internat. Math. Res. Notices 1994, no. 10, 401-414.
(with I. Rasa) *The Gleason-Kahane-Zelazko property and Korovkin
systems in symmetric involutive Banach algebras*, Arch. Math. (Basel) **61**
(1993), 163-169.
*The Gleason - Kahane - Zelazko theorem*, Proc. IInd Conf.
Functional Anal., Aquafredda di Maratea **1993** , ed. by F. Altomare
; G. Mastroianni, 177-188.
*Le theoreme de Gleason-Kahane-Zelazko et les spectres de
Ransford*, C. R. Acad. Sci. Paris Ser.I **313** (1991), 679-683.
(with C.Cottin) *Korovkin-type theorems for generalized Boolean
sum operators*, Colloq. Math. Soc. J. Bolyai **58** (1991), 51-68,
North-Holland, Amsterdam (ed K. Tandori ; J. Szabados)
*On a Korovkin-type theorem for simultaneous approximation*,
J. Approx. Theory **62** (1990), 223-234.
(with D.Andrica) *Gruss inequality for positive linear
functionals*, Period. Math. Hungar. **19** (1988), 155-167.
*Note on a conjecture of P.D.T.A. Elliott*, Archivum Math. **23**
(1987), 21-24.

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