Catalin Badea
Professeur des universités
CNU : SECTION 25 - MATHEMATIQUES
Laboratoire / équipe
Publications
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"citationFull_s":"Catalin Badea, Sophie Grivaux. Around Furstenberg's times $p$, times $q$ conjecture: times $p$-invariant measures with some large Fourier coefficients. <i>Discrete Analysis</i>, 2024, <a target=\"_blank\" href=\"https://dx.doi.org/10.19086/da.124611\">⟨10.19086/da.124611⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-04010987v1\">⟨hal-04010987⟩</a>",
"title_s":["Around Furstenberg's times $p$, times $q$ conjecture: times $p$-invariant measures with some large Fourier coefficients"],
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"citationRef_s":"<i>Complex Analysis and Operator Theory</i>, 2022, 16 (8), pp.115. <a target=\"_blank\" href=\"https://dx.doi.org/10.1007/s11785-022-01293-w\">⟨10.1007/s11785-022-01293-w⟩</a>",
"citationFull_s":"Catalin Badea, Oscar Devys. Rochberg's abstract coboundary theorem revisited. <i>Complex Analysis and Operator Theory</i>, 2022, 16 (8), pp.115. <a target=\"_blank\" href=\"https://dx.doi.org/10.1007/s11785-022-01293-w\">⟨10.1007/s11785-022-01293-w⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-04398987v1\">⟨hal-04398987⟩</a>",
"title_s":["Rochberg's abstract coboundary theorem revisited"],
"authFullName_s":["Catalin Badea","Oscar Devys"],
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"citationRef_s":"<i>Journal d'analyse mathématique</i>, 2021, 143 (1), pp.313-347. <a target=\"_blank\" href=\"https://dx.doi.org/10.1007/s11854-021-0165-4\">⟨10.1007/s11854-021-0165-4⟩</a>",
"citationFull_s":"Catalin Badea, Sophie Grivaux, Étienne Matheron. Rigidity sequences, Kazhdan sets and group topologies on the integers. <i>Journal d'analyse mathématique</i>, 2021, 143 (1), pp.313-347. <a target=\"_blank\" href=\"https://dx.doi.org/10.1007/s11854-021-0165-4\">⟨10.1007/s11854-021-0165-4⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-02266204v1\">⟨hal-02266204⟩</a>",
"title_s":["Rigidity sequences, Kazhdan sets and group topologies on the integers"],
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"citationRef_s":"<i>J. Operator Th.</i>, 2021, 86 (1), pp.93-123. <a target=\"_blank\" href=\"https://dx.doi.org/10.7900/jot.2020feb05.2298\">⟨10.7900/jot.2020feb05.2298⟩</a>",
"citationFull_s":"Catalin Badea, Laurian Suciu. HILBERT SPACE OPERATORS WITH TWO-ISOMETRIC DILATIONS. <i>J. Operator Th.</i>, 2021, 86 (1), pp.93-123. <a target=\"_blank\" href=\"https://dx.doi.org/10.7900/jot.2020feb05.2298\">⟨10.7900/jot.2020feb05.2298⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-03494639v1\">⟨hal-03494639⟩</a>",
"title_s":["HILBERT SPACE OPERATORS WITH TWO-ISOMETRIC DILATIONS"],
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"citationRef_s":"<i>Canadian Mathematical Bulletin</i>, 2020, 63 (3), pp.484-505. <a target=\"_blank\" href=\"https://dx.doi.org/10.4153/S0008439519000560\">⟨10.4153/S0008439519000560⟩</a>",
"citationFull_s":"Catalin Badea, Vincent Devinck, Sophie Grivaux. Escaping a neighborhood along a prescribed sequence in Lie groups and Banach algebras. <i>Canadian Mathematical Bulletin</i>, 2020, 63 (3), pp.484-505. <a target=\"_blank\" href=\"https://dx.doi.org/10.4153/S0008439519000560\">⟨10.4153/S0008439519000560⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-02308604v1\">⟨hal-02308604⟩</a>",
"title_s":["Escaping a neighborhood along a prescribed sequence in Lie groups and Banach algebras"],
"authFullName_s":["Catalin Badea","Vincent Devinck","Sophie Grivaux"],
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"citationRef_s":"<i>Mediterranean Journal of Mathematics</i>, 2019",
"citationFull_s":"Catalin Badea, Laurian Suciu. SIMILARITY PROBLEMS, FØLNER SETS AND ISOMETRIC REPRESENTATIONS OF AMENABLE SEMIGROUPS. <i>Mediterranean Journal of Mathematics</i>, 2019. <a target=\"_blank\" href=\"https://hal.science/hal-03494644v1\">⟨hal-03494644⟩</a>",
"title_s":["SIMILARITY PROBLEMS, FØLNER SETS AND ISOMETRIC REPRESENTATIONS OF AMENABLE SEMIGROUPS"],
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"citationRef_s":"<i>Journal of Mathematical Analysis and Applications</i>, 2019",
"citationFull_s":"Catalin Badea, Laurian Suciu. THE CAUCHY DUAL AND 2-ISOMETRIC LIFTINGS OF CONCAVE OPERATORS. <i>Journal of Mathematical Analysis and Applications</i>, 2019. <a target=\"_blank\" href=\"https://hal.science/hal-03494647v1\">⟨hal-03494647⟩</a>",
"title_s":["THE CAUCHY DUAL AND 2-ISOMETRIC LIFTINGS OF CONCAVE OPERATORS"],
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"citationRef_s":"<i>Commentarii Mathematici Helvetici</i>, 2019, 95 (1), pp.99-127. <a target=\"_blank\" href=\"https://dx.doi.org/10.4171/cmh/482\">⟨10.4171/cmh/482⟩</a>",
"citationFull_s":"Catalin Badea, Sophie Grivaux. Kazhdan constants, continuous probability measures with large Fourier coefficients and rigidity sequences. <i>Commentarii Mathematici Helvetici</i>, 2019, 95 (1), pp.99-127. <a target=\"_blank\" href=\"https://dx.doi.org/10.4171/cmh/482\">⟨10.4171/cmh/482⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-02140446v1\">⟨hal-02140446⟩</a>",
"title_s":["Kazhdan constants, continuous probability measures with large Fourier coefficients and rigidity sequences"],
"authFullName_s":["Catalin Badea","Sophie Grivaux"],
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"citationRef_s":"<i>Bulletin of the London Mathematical Society</i>, 2018, 50 (6), pp.986-996. <a target=\"_blank\" href=\"https://dx.doi.org/10.1112/blms.12191\">⟨10.1112/blms.12191⟩</a>",
"citationFull_s":"Catalin Badea, Michel Crouzeix, Hubert Klaja. SPECTRAL SETS AND OPERATOR RADII. <i>Bulletin of the London Mathematical Society</i>, 2018, 50 (6), pp.986-996. <a target=\"_blank\" href=\"https://dx.doi.org/10.1112/blms.12191\">⟨10.1112/blms.12191⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-01821886v1\">⟨hal-01821886⟩</a>",
"title_s":["SPECTRAL SETS AND OPERATOR RADII"],
"authFullName_s":["Catalin Badea","Michel Crouzeix","Hubert Klaja"],
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"citationRef_s":"<i>Journal of Functional Analysis</i>, 2017, 273 (6), pp.1931-1969. <a target=\"_blank\" href=\"https://dx.doi.org/10.1016/j.jfa.2017.05.010\">⟨10.1016/j.jfa.2017.05.010⟩</a>",
"citationFull_s":"Catalin Badea, Sophie Grivaux. Kazhdan sets in groups and equidistribution properties. <i>Journal of Functional Analysis</i>, 2017, 273 (6), pp.1931-1969. <a target=\"_blank\" href=\"https://dx.doi.org/10.1016/j.jfa.2017.05.010\">⟨10.1016/j.jfa.2017.05.010⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-03494684v1\">⟨hal-03494684⟩</a>",
"title_s":["Kazhdan sets in groups and equidistribution properties"],
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"citationRef_s":"<i>Revista Matemática Iberoamericana</i>, 2017, 33 (2), pp.469-488. <a target=\"_blank\" href=\"https://dx.doi.org/10.4171/RMI/945\">⟨10.4171/RMI/945⟩</a>",
"citationFull_s":"Catalin Badea, Laurian Suciu, Dan Timotin. Classes of contractions and Harnack domination. <i>Revista Matemática Iberoamericana</i>, 2017, 33 (2), pp.469-488. <a target=\"_blank\" href=\"https://dx.doi.org/10.4171/RMI/945\">⟨10.4171/RMI/945⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-03494691v1\">⟨hal-03494691⟩</a>",
"title_s":["Classes of contractions and Harnack domination"],
"authFullName_s":["Catalin Badea","Laurian Suciu","Dan Timotin"],
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"citationRef_s":"Sémin. Congr. <i>Actes du 1er Congrès National de la SMF - Tours, 2016</i>, 31, Soc. Math. France, pp.37-75, 2017",
"citationFull_s":"Catalin Badea, Sophie Grivaux. Sets of integers determined by operator-theoretical properties: Jamison and Kazhdan sets in the group Z. Sémin. Congr. <i>Actes du 1er Congrès National de la SMF - Tours, 2016</i>, 31, Soc. Math. France, pp.37-75, 2017. <a target=\"_blank\" href=\"https://hal.science/hal-03494660v1\">⟨hal-03494660⟩</a>",
"title_s":["Sets of integers determined by operator-theoretical properties: Jamison and Kazhdan sets in the group Z"],
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"citationRef_s":"<i>Pure and Applied Functional Analysis</i>, 2017",
"citationFull_s":"Catalin Badea, David Seifert. QUANTIFIED ASYMPTOTIC BEHAVIOUR OF BANACH SPACE OPERATORS AND APPLICATIONS TO ITERATIVE PROJECTION METHODS. <i>Pure and Applied Functional Analysis</i>, 2017. <a target=\"_blank\" href=\"https://hal.science/hal-03494675v1\">⟨hal-03494675⟩</a>",
"title_s":["QUANTIFIED ASYMPTOTIC BEHAVIOUR OF BANACH SPACE OPERATORS AND APPLICATIONS TO ITERATIVE PROJECTION METHODS"],
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"citationRef_s":"<i>Journal of Approximation Theory</i>, 2016, 205, pp.133-148. <a target=\"_blank\" href=\"https://dx.doi.org/10.1016/j.jat.2016.02.001\">⟨10.1016/j.jat.2016.02.001⟩</a>",
"citationFull_s":"Catalin Badea, David Seifert. Ritt operators and convergence in the method of alternating projections. <i>Journal of Approximation Theory</i>, 2016, 205, pp.133-148. <a target=\"_blank\" href=\"https://dx.doi.org/10.1016/j.jat.2016.02.001\">⟨10.1016/j.jat.2016.02.001⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-03494686v1\">⟨hal-03494686⟩</a>",
"title_s":["Ritt operators and convergence in the method of alternating projections"],
"authFullName_s":["Catalin Badea","David Seifert"],
"halId_s":"hal-03494686",
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"citationRef_s":"2015",
"citationFull_s":"Catalin Badea, Laurian Suciu. Harnack and Shmul'yan pre-order relations for Hilbert space contractions. 2015. <a target=\"_blank\" href=\"https://hal.science/hal-01232071v1\">⟨hal-01232071⟩</a>",
"title_s":["Harnack and Shmul'yan pre-order relations for Hilbert space contractions"],
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"citationRef_s":"2013",
"citationFull_s":"Catalin Badea, Bernhard Beckermann. Spectral Sets. 2013. <a target=\"_blank\" href=\"https://hal.science/hal-00782470v1\">⟨hal-00782470⟩</a>",
"title_s":["Spectral Sets"],
"authFullName_s":["Catalin Badea","Bernhard Beckermann"],
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"citationRef_s":"<i>Operators and Matrices</i>, 2013, 7 (2), pp.285-292. <a target=\"_blank\" href=\"https://dx.doi.org/10.7153/oam-07-16\">⟨10.7153/oam-07-16⟩</a>",
"citationFull_s":"Catalin Badea, Michel Crouzeix. Numerical radius and distance from unitary operators. <i>Operators and Matrices</i>, 2013, 7 (2), pp.285-292. <a target=\"_blank\" href=\"https://dx.doi.org/10.7153/oam-07-16\">⟨10.7153/oam-07-16⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-00634780v2\">⟨hal-00634780v2⟩</a>",
"title_s":["Numerical radius and distance from unitary operators"],
"authFullName_s":["Catalin Badea","Michel Crouzeix"],
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"citationRef_s":"<i>St. Petersburg Mathematical Journal</i>, 2012, 23 (3), pp.413-434. <a target=\"_blank\" href=\"https://dx.doi.org/10.1090/S1061-0022-2012-01202-1\">⟨10.1090/S1061-0022-2012-01202-1⟩</a>",
"citationFull_s":"Catalin Badea, Sophie Grivaux, Vladimir Müller. The rate of convergence in the method of alternating projections. <i>St. Petersburg Mathematical Journal</i>, 2012, 23 (3), pp.413-434. <a target=\"_blank\" href=\"https://dx.doi.org/10.1090/S1061-0022-2012-01202-1\">⟨10.1090/S1061-0022-2012-01202-1⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-03494696v1\">⟨hal-03494696⟩</a>",
"title_s":["The rate of convergence in the method of alternating projections"],
"authFullName_s":["Catalin Badea","Sophie Grivaux","Vladimir Müller"],
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"citationRef_s":"<i>Ergodic Theory and Dynamical Systems</i>, 2010, 30 (6), pp.1597-1606. <a target=\"_blank\" href=\"https://dx.doi.org/10.1017/S0143385709000765\">⟨10.1017/S0143385709000765⟩</a>",
"citationFull_s":"Catalin Badea, Sophie Grivaux, Vladimir Müller. Epsilon-hypercyclic operators. <i>Ergodic Theory and Dynamical Systems</i>, 2010, 30 (6), pp.1597-1606. <a target=\"_blank\" href=\"https://dx.doi.org/10.1017/S0143385709000765\">⟨10.1017/S0143385709000765⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-03982984v1\">⟨hal-03982984⟩</a>",
"title_s":["Epsilon-hypercyclic operators"],
"authFullName_s":["Catalin Badea","Sophie Grivaux","Vladimir Müller"],
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"citationRef_s":"<i>Studia Mathematica</i>, 2010, 201 (1), pp.21-35",
"citationFull_s":"Catalin Badea, Yuri I Lyubich. GEOMETRIC, SPECTRAL AND ASYMPTOTIC PROPERTIES OF AVERAGED PRODUCTS OF PROJECTIONS IN BANACH SPACES. <i>Studia Mathematica</i>, 2010, 201 (1), pp.21-35. <a target=\"_blank\" href=\"https://hal.science/hal-03494694v1\">⟨hal-03494694⟩</a>",
"title_s":["GEOMETRIC, SPECTRAL AND ASYMPTOTIC PROPERTIES OF AVERAGED PRODUCTS OF PROJECTIONS IN BANACH SPACES"],
"authFullName_s":["Catalin Badea","Yuri I Lyubich"],
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"citationRef_s":"<i>Comptes Rendus. Mathématique</i>, 2010, 348 (1-2), pp.53-56. <a target=\"_blank\" href=\"https://dx.doi.org/10.1016/j.crma.2009.11.018\">⟨10.1016/j.crma.2009.11.018⟩</a>",
"citationFull_s":"Catalin Badea, Sophie Grivaux, Vladimir Müller. A generalization of the Friedrichs angle and the method of alternating projections. <i>Comptes Rendus. Mathématique</i>, 2010, 348 (1-2), pp.53-56. <a target=\"_blank\" href=\"https://dx.doi.org/10.1016/j.crma.2009.11.018\">⟨10.1016/j.crma.2009.11.018⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-03982995v1\">⟨hal-03982995⟩</a>",
"title_s":["A generalization of the Friedrichs angle and the method of alternating projections"],
"authFullName_s":["Catalin Badea","Sophie Grivaux","Vladimir Müller"],
"halId_s":"hal-03982995",
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"citationRef_s":"<i>Proceedings of the American Mathematical Society</i>, 2009, 137 (4), pp.1397-1403. <a target=\"_blank\" href=\"https://dx.doi.org/10.1090/S0002-9939-08-09696-2\">⟨10.1090/S0002-9939-08-09696-2⟩</a>",
"citationFull_s":"Catalin Badea, Sophie Grivaux, Vladimir Müller. Multiples of hypercyclic operators. <i>Proceedings of the American Mathematical Society</i>, 2009, 137 (4), pp.1397-1403. <a target=\"_blank\" href=\"https://dx.doi.org/10.1090/S0002-9939-08-09696-2\">⟨10.1090/S0002-9939-08-09696-2⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-03983010v1\">⟨hal-03983010⟩</a>",
"title_s":["Multiples of hypercyclic operators"],
"authFullName_s":["Catalin Badea","Sophie Grivaux","Vladimir Müller"],
"halId_s":"hal-03983010",
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"citationRef_s":"<i>Communications on Pure and Applied Mathematics</i>, 2009, 8 (1), pp.37-54. <a target=\"_blank\" href=\"https://dx.doi.org/10.3934/cpaa.2009.8.37\">⟨10.3934/cpaa.2009.8.37⟩</a>",
"citationFull_s":"Catalin Badea, Bernhard Beckermann, Michel Crouzeix. INTERSECTIONS OF SEVERAL DISKS OF THE RIEMANN SPHERE AS K-SPECTRAL SETS. <i>Communications on Pure and Applied Mathematics</i>, 2009, 8 (1), pp.37-54. <a target=\"_blank\" href=\"https://dx.doi.org/10.3934/cpaa.2009.8.37\">⟨10.3934/cpaa.2009.8.37⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-00365343v1\">⟨hal-00365343⟩</a>",
"title_s":["INTERSECTIONS OF SEVERAL DISKS OF THE RIEMANN SPHERE AS K-SPECTRAL SETS"],
"authFullName_s":["Catalin Badea","Bernhard Beckermann","Michel Crouzeix"],
"halId_s":"hal-00365343",
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"producedDateY_i":2009
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"citationRef_s":"<i>Israel Journal of Mathematics</i>, 2008, 165 (1), pp.43-65. <a target=\"_blank\" href=\"https://dx.doi.org/10.1007/s11856-008-1003-4\">⟨10.1007/s11856-008-1003-4⟩</a>",
"citationFull_s":"Catalin Badea, Sophie Grivaux. Faber-hypercyclic operators. <i>Israel Journal of Mathematics</i>, 2008, 165 (1), pp.43-65. <a target=\"_blank\" href=\"https://dx.doi.org/10.1007/s11856-008-1003-4\">⟨10.1007/s11856-008-1003-4⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-03983022v1\">⟨hal-03983022⟩</a>",
"title_s":["Faber-hypercyclic operators"],
"authFullName_s":["Catalin Badea","Sophie Grivaux"],
"halId_s":"hal-03983022",
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"producedDateY_i":2008
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"citationRef_s":"2007",
"citationFull_s":"Catalin Badea, Bernhard Beckermann, Michel Crouzeix. K-spectral sets and intersections of disks of the Riemann sphere. 2007. <a target=\"_blank\" href=\"https://hal.science/hal-00905874v1\">⟨hal-00905874⟩</a>",
"title_s":["K-spectral sets and intersections of disks of the Riemann sphere"],
"authFullName_s":["Catalin Badea","Bernhard Beckermann","Michel Crouzeix"],
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"citationRef_s":"<i>Advances in Mathematics</i>, 2007, 211 (2), pp.766-793. <a target=\"_blank\" href=\"https://dx.doi.org/10.1016/j.aim.2006.09.010\">⟨10.1016/j.aim.2006.09.010⟩</a>",
"citationFull_s":"Catalin Badea, Sophie Grivaux. Unimodular eigenvalues, uniformly distributed sequences and linear dynamics. <i>Advances in Mathematics</i>, 2007, 211 (2), pp.766-793. <a target=\"_blank\" href=\"https://dx.doi.org/10.1016/j.aim.2006.09.010\">⟨10.1016/j.aim.2006.09.010⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-03983033v1\">⟨hal-03983033⟩</a>",
"title_s":["Unimodular eigenvalues, uniformly distributed sequences and linear dynamics"],
"authFullName_s":["Catalin Badea","Sophie Grivaux"],
"halId_s":"hal-03983033",
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"citationRef_s":"<i>Journal of Functional Analysis</i>, 2007, 246 (2), pp.302-329. <a target=\"_blank\" href=\"https://dx.doi.org/10.1016/j.jfa.2007.02.009\">⟨10.1016/j.jfa.2007.02.009⟩</a>",
"citationFull_s":"Catalin Badea, Sophie Grivaux. Size of the peripheral point spectrum under power or resolvent growth conditions. <i>Journal of Functional Analysis</i>, 2007, 246 (2), pp.302-329. <a target=\"_blank\" href=\"https://dx.doi.org/10.1016/j.jfa.2007.02.009\">⟨10.1016/j.jfa.2007.02.009⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-03983037v1\">⟨hal-03983037⟩</a>",
"title_s":["Size of the peripheral point spectrum under power or resolvent growth conditions"],
"authFullName_s":["Catalin Badea","Sophie Grivaux"],
"halId_s":"hal-03983037",
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"producedDateY_i":2007
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"citationRef_s":"<i>Mathematische Zeitschrift</i>, 2006, 252 (2), pp.345-365. <a target=\"_blank\" href=\"https://dx.doi.org/10.1007/s00209-005-0857-y\">⟨10.1007/s00209-005-0857-y⟩</a>",
"citationFull_s":"Catalin Badea, Michel Crouzeix, Bernard Delyon. Convex domains and K-spectral sets. <i>Mathematische Zeitschrift</i>, 2006, 252 (2), pp.345-365. <a target=\"_blank\" href=\"https://dx.doi.org/10.1007/s00209-005-0857-y\">⟨10.1007/s00209-005-0857-y⟩</a>. <a target=\"_blank\" href=\"https://hal.science/hal-00012448v1\">⟨hal-00012448⟩</a>",
"title_s":["Convex domains and K-spectral sets"],
"authFullName_s":["Catalin Badea","Michel Crouzeix","Bernard Delyon"],
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