47A12

Articles containing subject class 47A12:

OaM-01-24 » Higher-rank numerical ranges of unitary and normal matrices (09/2007)
OaM-02-08 » Numerical Radius Inequalities for Square-zero and Idempotent Operators (03/2008)
OaM-02-16 » Higher-rank numerical range in infinite-dimensional Hilbert space (06/2008)
OaM-02-20 » Davis-Wielandt shells of operators (09/2008)
JMI-02-45 » Norm and numerical radius inequalities for a product of two linear operators in Hilbert spaces (12/2008)
JMI-03-01 » Q-norm inequalities for sequences of Hilbert space operators (03/2009)
OaM-03-21 » Essentially hermitian matrices and inclusion relations of C-numerical ranges (09/2009)
JMI-03-35 » Characterization of the norm triangle equality in pre-Hilbert C✻-modules and applications (09/2009)
OaM-04-05 » On operators with large self-commutators (03/2010)
OaM-04-14 » Operator radii and unitary operators (06/2010)
OaM-06-09 » Maps preserving peripheral spectrum of Jordan products of operators (03/2012)
OaM-06-41 » The possible shapes of numerical ranges (09/2012)
OaM-07-11 » The numerical radii of weighted shift matrices and operators (03/2013)
OaM-07-16 » Numerical radius and distance from unitary operators (06/2013)
MIA-16-52 » Unitarily invariant norms related to the numerical radius on B(H) (07/2013)
OaM-07-47 » Normal matrix compressions (12/2013)
OaM-07-48 » Matrices with defect index one (12/2013)
OaM-08-39 » Pre-images of boundary points of the numerical range (09/2014)
OaM-08-51 » The block numerical range of analytic operator functions (12/2014)
OaM-09-04 » Algebraic properties of the set of operators with 0 in the closure of the numerical range (03/2015)
OaM-09-19 » C∗-envelopes of Jordan operator systems (06/2015)
MIA-18-68 » Numerical radius inequalities associated with the Cartesian decomposition (07/2015)
OaM-09-32 » An observation concerning boundary points of the numerical range (09/2015)
MIA-19-47 » A Fiedler-type theorem for the determinant of J-positive matrices (04/2016)
OaM-10-36 » The correlation numerical range and trace-positive complex polynomials (09/2016)
OaM-10-45 » The trace as an average over the unit sphere of a normed space with a 1-symmetric basis (09/2016)
OaM-10-58 » Pre-images of extreme points of the numerical range, and applications (12/2016)
JMI-10-83 » Numerical radius inequalities for Hilbert space operators (12/2016)
OaM-11-12 » Numerical ranges of the product of operators (03/2017)
OaM-11-15 » On the normalized numerical range (03/2017)
OaM-11-18 » Pseudospectrum of an element of a Banach algebra (03/2017)
OaM-11-51 » Spectral sets for numerical range (09/2017)
OaM-11-62 » An observation about normaloid operators (09/2017)
OaM-12-15 » On the block numerical range of operators on arbitrary Banach spaces (03/2018)
OaM-12-16 » Scalar approximants of quadratic operators with applications (03/2018)
JMI-12-19 » Maximal numerical range of a compact set and applications to some Dragomir's inequalities (03/2018)
OaM-12-26 » Sharpening some classical numerical radius inequalities (06/2018)
JMI-12-33 » Some generalizations of numerical radius on off-diagonal part of 2 × 2 operator matrices (06/2018)
JMI-12-76 » On the inverse power inequality for the Berezin number of operators (12/2018)
OaM-13-37 » Numerical radius inequalities related to the geometric means of negative power (06/2019)
OaM-13-45 » A note on the maximal numerical range (09/2019)
MIA-22-83 » Operator inequalities via geometric convexity (10/2019)
OaM-13-72 » Constant norms and numerical radii of matrix powers (12/2019)
OaM-13-77 » On the maximal numerical range of a hyponormal operator (12/2019)
JMI-13-68 » Further inequalities for the numerical radius of Hilbert space operators (12/2019)
JMI-13-79 » Complete refinements of the Berezin number inequalities (12/2019)
OaM-14-06 » Inverse continuity of the numerical range map for Hilbert space operators (03/2020)
OaM-14-07 » Operators with minimal pseudospectra and connections to normality (03/2020)
OaM-14-08 » Some new operator inequalities (03/2020)
OaM-14-18 » On the numerical range and operator norm of V2 (03/2020)
MIA-23-55 » Operator norm and numerical radius analogues of Cohen's inequality (04/2020)
MIA-23-76 » Bounds of numerical radius of bounded linear operators using t-Aluthge transform (07/2020)
MIA-23-80 » New norm equalities and inequalities for certain operator matrices (07/2020)
MIA-23-85 » Cauchy-Schwarz type inequalities and applications to numerical radius inequalities (07/2020)
OaM-14-62 » Topological properties of the block numerical range of operator matrices (12/2020)
MIA-24-12 » Sharp inequalities for the numerical radius of Hilbert space operators and operator matrices (01/2021)
OaM-15-26 » Numerical ranges encircled by analytic curves (03/2021)
MIA-24-28 » Joint numerical radius of spherical Aluthge transforms of tuples of Hilbert space operators (04/2021)
MIA-24-32 » Approximate ω-orthogonality and ω-derivation (04/2021)
OaM-15-33 » Preservers of the c-numerical radius of operator jordan semi-triple products (06/2021)
OaM-15-38 » Isoclinic subspaces and quantum error correction (06/2021)
OaM-15-67 » Approximation of the numerical range of polynomial operator matrices (09/2021)
JMI-15-77 » A Chain of numerical radius inequalities in complex Hilbert space (09/2021)
MIA-24-71 » Numerical radius in Hilbert C✻ (10/2021)
OaM-15-76 » On generalized Davis-Wielandt radius inequalities of semi-Hilbertian space operators (12/2021)
OaM-15-81 » Generalized numerical radius and related inequalities (12/2021)
OaM-15-86 » Revisiting the Grüss inequality (12/2021)
OaM-15-89 » Some general quadratic numerical radius inequalities for the off-diagonal parts of 2 ⨉ 2 block operator matrices (12/2021)
OaM-15-90 » Davis-Wielandt-Berezin radius inequalities via Dragomir inequalities (12/2021)
OaM-15-93 » Maximal numerical range and quadratic elements in a C✻-algebra (12/2021)
OaM-16-19 » Buzano, Kreĭn and Cauchy-Schwarz inequalities (03/2022)
OaM-16-24 » Determinantal polynomials of a weighted shift matrix with palindromic geometric weights (06/2022)
OaM-16-27 » Gaps between some spectral characteristics of direct sum of Hilbert space operators (06/2022)
JMI-16-31 » Some refinements of numerical radius inequalities for 2 × 2 operator matrices (06/2022)
JMI-16-39 » Some generalized numerical radius inequalities for Hilbert space operators (06/2022)
JMI-16-60 » Estimates for the numerical radius of n × n operator matrices (09/2022)
OaM-16-75 » Numerical radii of weighted shift operators using determinantal polynomials (12/2022)
OaM-17-14 » Numerical ranges of some Foguel operators (03/2023)
OaM-17-18 » Further refinements of some numerical radius inequalities for operators (03/2023)
JMI-17-17 » Norm-parallelism of Hilbert space operators and the Davis-Wielandt Berezin number (03/2023)
MIA-26-27 » New orders among Hilbert space operators (04/2023)
OaM-17-22 » Maximal numerical range of the bimultiplication M2, A, B (06/2023)
OaM-17-24 » Inequalities for the weighted A-numerical radius of semi-Hilbertian space operators (06/2023)
OaM-17-39 » Computing the S-numerical ranges of differential operators (09/2023)
OaM-17-40 » A note on the A-spectrum of A-bounded operators (09/2023)
OaM-17-50 » Further refinements of Davis-Wielandt radius inequalities (09/2023)
OaM-17-56 » On joint numerical radius of operators and joint numerical index of a Banach space (09/2023)
JMI-17-64 » Numerical radius of products of special matrices (09/2023)
OaM-17-63 » Spectral inclusion property for a class of block operator matrices (12/2023)
OaM-17-71 » Numerical radii of weighted shift matrices with palindromic weights using determinantal polynomials (12/2023)
JMI-17-89 » Generalized numerical radius inequalities involving positive semidefinite block matrices (12/2023)
MIA-27-07 » On the joint numerical radius of generalized spherical Aluthge transforms of operators (01/2024)
OaM-18-05 » Inner product inequalities through Cartesian decomposition with applications to numerical radius inequalities (03/2024)
OaM-18-06 » Berezin number inequalities via positivity of 2 × 2 block matrices (03/2024)
OaM-18-09 » On the Berezin number of operator matrices (03/2024)
JMI-18-13 » Some improvements about numerical radius inequalities for Hilbert space operators (03/2024)