Duggal, B. P.; Kim, I. H. Products of generalized \(n\)-projections. (English) Zbl 07820058 Linear Multilinear Algebra 72, No. 5, 707-717 (2024). MSC: 47A62 47B10 47B20 15A69 47A05 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Kim}, Linear Multilinear Algebra 72, No. 5, 707--717 (2024; Zbl 07820058) Full Text: DOI
Duggal, B. P. Products of pairs of commuting \(d\)-tuples of Banach space operators satisfying an \(m\)-isometric property. (English) Zbl 07797024 Rend. Circ. Mat. Palermo (2) 73, No. 1, 291-298 (2024). MSC: 47A05 47A55 47A11 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal}, Rend. Circ. Mat. Palermo (2) 73, No. 1, 291--298 (2024; Zbl 07797024) Full Text: DOI
Duggal, B. P.; Kubrusly, C. S. Forms of biisometric operators and biorthogonality. arXiv:2401.16790 Preprint, arXiv:2401.16790 [math.FA] (2024). MSC: 47A05 47A30 47B49 46B15 BibTeX Cite \textit{B. P. Duggal} and \textit{C. S. Kubrusly}, ``Forms of biisometric operators and biorthogonality'', Preprint, arXiv:2401.16790 [math.FA] (2024) Full Text: arXiv OA License
Duggal, Bhagwati P.; Kim, In Hyoun Operators \(a, B\) for which the Aluthge transform \(\widetilde{AB}\) is a generalised \(n\)-projection. (English) Zbl 07780355 Bull. Korean Math. Soc. 60, No. 6, 1555-1566 (2023). MSC: 47A62 47B10 47B20 15A69 47A05 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Kim}, Bull. Korean Math. Soc. 60, No. 6, 1555--1566 (2023; Zbl 07780355) Full Text: DOI
Duggal, B. P.; Kim, I. H. Isometric, symmetric and isosymmetric commuting \(d\)-tuples of Banach space operators. (English) Zbl 07667655 Result. Math. 78, No. 3, Paper No. 85, 25 p. (2023). Reviewer: Trieu Le (Toledo) MSC: 47A13 47A55 47A11 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Kim}, Result. Math. 78, No. 3, Paper No. 85, 25 p. (2023; Zbl 07667655) Full Text: DOI arXiv
Duggal, B. P.; Kim, I. H. Expansive operators and Drazin invertibility. (English) Zbl 1523.47036 Rend. Circ. Mat. Palermo (2) 72, No. 1, 341-353 (2023). MSC: 47B20 47A05 47A30 47A11 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Kim}, Rend. Circ. Mat. Palermo (2) 72, No. 1, 341--353 (2023; Zbl 1523.47036) Full Text: DOI
Duggal, B. P. On strict isometric and strict symmetric commuting \(d\)-tuples of Banach space operators. arXiv:2305.00898 Preprint, arXiv:2305.00898 [math.FA] (2023). MSC: 47A05 47A55 47A11 47B47 BibTeX Cite \textit{B. P. Duggal}, ``On strict isometric and strict symmetric commuting $d$-tuples of Banach space operators'', Preprint, arXiv:2305.00898 [math.FA] (2023) Full Text: arXiv OA License
Duggal, B. P.; Kim, I. H. \(m\)-isometric generalised derivations. (English) Zbl 1509.47048 Concr. Oper. 9, 139-150 (2022). MSC: 47B47 47A80 47B10 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Kim}, Concr. Oper. 9, 139--150 (2022; Zbl 1509.47048) Full Text: DOI
Duggal, B. P.; Kim, I. H. Left \(m\)-invertibility by the adjoint of Drazin inverse and \(m\)-selfadjointness of Hilbert spaces. (English) Zbl 1522.47002 Linear Multilinear Algebra 70, No. 12, 2264-2277 (2022). Reviewer: K. C. Sivakumar (Chennai) MSC: 47A05 47A55 47A11 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Kim}, Linear Multilinear Algebra 70, No. 12, 2264--2277 (2022; Zbl 1522.47002) Full Text: DOI
Duggal, B. P.; Kim, I. H. Expansive operators which are power bounded or algebraic. (English) Zbl 1516.47037 Oper. Matrices 16, No. 1, 197-211 (2022). Reviewer: Trieu Le (Toledo) MSC: 47B02 47B47 47B65 47A55 47A63 47A65 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Kim}, Oper. Matrices 16, No. 1, 197--211 (2022; Zbl 1516.47037) Full Text: DOI arXiv
Duggal, B. P. On \((m, P)\)-expansive operators: products, perturbation by nilpotents, Drazin invertibility. (English) Zbl 07427888 Concr. Oper. 8, 158-175 (2021). MSC: 47A05 47A55 47A11 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal}, Concr. Oper. 8, 158--175 (2021; Zbl 07427888) Full Text: DOI
Duggal, B. P.; Kim, I. H. Structure of elementary operators defining \(m\)-left invertible, \(m\)-selfadjoint and related classes of operators. (English) Zbl 07315384 J. Math. Anal. Appl. 495, No. 1, Article ID 124718, 15 p. (2021). MSC: 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Kim}, J. Math. Anal. Appl. 495, No. 1, Article ID 124718, 15 p. (2021; Zbl 07315384) Full Text: DOI arXiv
Duggal, B. P.; Kim, I. H. On \(n\)th roots of normal operators. (English) Zbl 1500.47033 Filomat 34, No. 8, 2797-2803 (2020). MSC: 47B15 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Kim}, Filomat 34, No. 8, 2797--2803 (2020; Zbl 1500.47033) Full Text: DOI arXiv
Kubrusly, C. S.; Duggal, B. P. Asymptotic limits, Banach limits and Cesáro means. (English) Zbl 07377897 Adv. Math. Sci. Appl. 29, No. 1, 145-170 (2020). MSC: 47A30 47A45 47A62 47B20 PDFBibTeX XMLCite \textit{C. S. Kubrusly} and \textit{B. P. Duggal}, Adv. Math. Sci. Appl. 29, No. 1, 145--170 (2020; Zbl 07377897) Full Text: arXiv
Duggal, B. P.; Kim, I. H. On power Drazin normal and Drazin quasi-normal Hilbert space operators. (English) Zbl 1482.47033 Oper. Matrices 14, No. 2, 523-533 (2020). MSC: 47B15 47B20 47A05 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Kim}, Oper. Matrices 14, No. 2, 523--533 (2020; Zbl 1482.47033) Full Text: DOI arXiv
Duggal, B. P.; Kim, I. H. Operator roots of polynomials:iso-symmetric operators. arXiv:2010.15474 Preprint, arXiv:2010.15474 [math.FA] (2020). MSC: 47A05 47A55 47A11 47B47 BibTeX Cite \textit{B. P. Duggal} and \textit{I. H. Kim}, ``Operator roots of polynomials:iso-symmetric operators'', Preprint, arXiv:2010.15474 [math.FA] (2020) Full Text: arXiv OA License
Duggal, B. P.; Kim, I. H. Left m-invertibility by the adjoint of Drazin inverse and m-selfadjointness of Hilbert space operators. arXiv:2001.09338 Preprint, arXiv:2001.09338 [math.FA] (2020). MSC: 47A05 47A55 47A11 47B47 BibTeX Cite \textit{B. P. Duggal} and \textit{I. H. Kim}, ``Left m-invertibility by the adjoint of Drazin inverse and m-selfadjointness of Hilbert space operators'', Preprint, arXiv:2001.09338 [math.FA] (2020) Full Text: arXiv OA License
Duggal, Bhagwati Prashad Isolated eigenvalues, poles and compact perturbations of Banach space operators. (English) Zbl 1514.47036 Oper. Matrices 13, No. 4, 955-973 (2019). MSC: 47B01 47A11 47A55 47A53 47B40 PDFBibTeX XMLCite \textit{B. P. Duggal}, Oper. Matrices 13, No. 4, 955--973 (2019; Zbl 1514.47036) Full Text: DOI arXiv
Duggal, Bhagwati On \(n\)-quasi left \(m\)-invertible operators. (English) Zbl 1428.47006 Funct. Anal. Approx. Comput. 11, No. 1, 21-37 (2019). MSC: 47B02 47A05 PDFBibTeX XMLCite \textit{B. Duggal}, Funct. Anal. Approx. Comput. 11, No. 1, 21--37 (2019; Zbl 1428.47006) Full Text: arXiv Link
Duggal, B. P.; Kim, I. H.; Kubrusly, C. S. Operators satisfying a similarity condition. (English) Zbl 07048429 Linear Multilinear Algebra 67, No. 5, 896-910 (2019). MSC: 47A05 47A62 47A12 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal} et al., Linear Multilinear Algebra 67, No. 5, 896--910 (2019; Zbl 07048429) Full Text: DOI
Duggal, B. P.; Kim, I. H. Perturbed Browder, Weyl theorems and their variations: an addendum. (English) Zbl 06902496 Funct. Anal. Approx. Comput. 10, No. 1, 21-27 (2018). MSC: 47A10 47A55 47A53 47B40 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Kim}, Funct. Anal. Approx. Comput. 10, No. 1, 21--27 (2018; Zbl 06902496) Full Text: Link
Kubrusly, Carlos S.; Duggal, Bhagwati P. On weak supercyclicity. II. (English) Zbl 1482.47012 Czech. Math. J. 68, No. 2, 371-386 (2018). Reviewer: Angela Albanese (Lecce) MSC: 47A16 47B15 PDFBibTeX XMLCite \textit{C. S. Kubrusly} and \textit{B. P. Duggal}, Czech. Math. J. 68, No. 2, 371--386 (2018; Zbl 1482.47012) Full Text: DOI arXiv
Duggal, B. P. Perturbed Browder, Weyl theorems and their variations: equivalences. (English) Zbl 06827492 Funct. Anal. Approx. Comput. 9, No. 2, 37-62 (2017). MSC: 47A10 47A55 47A53 47B40 PDFBibTeX XMLCite \textit{B. P. Duggal}, Funct. Anal. Approx. Comput. 9, No. 2, 37--62 (2017; Zbl 06827492) Full Text: Link
Duggal, B. P. Compact perturbations resulting in hereditarily polaroid operators. (English) Zbl 1485.47008 Bull. Belg. Math. Soc. - Simon Stevin 24, No. 3, 381-392 (2017). MSC: 47A10 47A55 47A53 47B40 PDFBibTeX XMLCite \textit{B. P. Duggal}, Bull. Belg. Math. Soc. - Simon Stevin 24, No. 3, 381--392 (2017; Zbl 1485.47008) Full Text: Euclid
Duggal, B. P.; Kubrusly, C. S. Perturbation of Banach space operators with a complemented range. (English) Zbl 1500.47020 Glasg. Math. J. 59, No. 3, 659-671 (2017). MSC: 47A55 47B01 47A53 47A10 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{C. S. Kubrusly}, Glasg. Math. J. 59, No. 3, 659--671 (2017; Zbl 1500.47020) Full Text: DOI
Duggal, B. P. Generalized Drazin invertibility and local spectral theory. (English) Zbl 1422.47037 Monatsh. Math. 182, No. 4, 841-849 (2017). Reviewer: Farida Lombarkia (Batna) MSC: 47B40 47A53 47A11 47A05 PDFBibTeX XMLCite \textit{B. P. Duggal}, Monatsh. Math. 182, No. 4, 841--849 (2017; Zbl 1422.47037) Full Text: DOI
Duggal, Bhaggy P.; Kim, In Hyoun Generalized Browder, Weyl spectra and the polaroid property under compact perturbations. (English) Zbl 1373.47005 J. Korean Math. Soc. 54, No. 1, 281-302 (2017). MSC: 47A10 47A55 47A53 47B40 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Kim}, J. Korean Math. Soc. 54, No. 1, 281--302 (2017; Zbl 1373.47005) Full Text: DOI Link
Duggal, B. P. Weak supercyclicity: dynamics of paranormal operators. (English) Zbl 1356.47027 Rend. Circ. Mat. Palermo (2) 65, No. 2, 297-306 (2016). MSC: 47B20 47A16 PDFBibTeX XMLCite \textit{B. P. Duggal}, Rend. Circ. Mat. Palermo (2) 65, No. 2, 297--306 (2016; Zbl 1356.47027) Full Text: DOI
Duggal, B. P.; Djordjević, Dragan S.; Harte, Robin E.; Živković-Zlatanović, Snežana Č. Polynomially meromorphic operators. (English) Zbl 1353.47036 Math. Proc. R. Ir. Acad. 116A, No. 1, 83-98 (2016). MSC: 47B06 PDFBibTeX XMLCite \textit{B. P. Duggal} et al., Math. Proc. R. Ir. Acad. 116A, No. 1, 83--98 (2016; Zbl 1353.47036) Full Text: DOI
Duggal, Bhaggy; Jeon, In Ho; Kim, In Hyoun Contractions without non-trivial invariant subspaces satisfying a positivity condition. (English) Zbl 1341.47025 J. Inequal. Appl. 2016, Paper No. 116, 8 p. (2016). MSC: 47B20 47A15 PDFBibTeX XMLCite \textit{B. Duggal} et al., J. Inequal. Appl. 2016, Paper No. 116, 8 p. (2016; Zbl 1341.47025) Full Text: DOI
Duggal, B. P. Generalized commutativity theorems for Hilbert space operators. (English) Zbl 1355.47019 Funct. Anal. Approx. Comput. 7, No. 2, 159-167 (2015). MSC: 47B47 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal}, Funct. Anal. Approx. Comput. 7, No. 2, 159--167 (2015; Zbl 1355.47019) Full Text: Link
Duggal, B. P.; Kubrusly, C. S.; Kim, I. H. Bishop’s property \((\beta)\), a commutativity theorem and the dynamics of class \(\mathcal A(s,t)\) operators. (English) Zbl 1330.47029 J. Math. Anal. Appl. 427, No. 1, 107-113 (2015). MSC: 47B20 47A16 PDFBibTeX XMLCite \textit{B. P. Duggal} et al., J. Math. Anal. Appl. 427, No. 1, 107--113 (2015; Zbl 1330.47029) Full Text: DOI
Duggal, B. P.; Kubrusly, C. S. Erratum to: “PF property and property \((\beta)\) for paranormal operators”. (English) Zbl 1331.47033 Rend. Circ. Mat. Palermo (2) 64, No. 1, 167-170 (2015). MSC: 47B20 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{C. S. Kubrusly}, Rend. Circ. Mat. Palermo (2) 64, No. 1, 167--170 (2015; Zbl 1331.47033) Full Text: DOI
Duggal, B. P. Commutativity theorems for normaloid Hilbert space operators. (English) Zbl 1339.47048 J. Math. Anal. Appl. 429, No. 1, 175-183 (2015). Reviewer: Daniel Beltiţă (Bucureşti) MSC: 47B47 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal}, J. Math. Anal. Appl. 429, No. 1, 175--183 (2015; Zbl 1339.47048) Full Text: DOI
Duggal, B. P. Compact perturbations and consequent hereditarily polaroid operators. arXiv:1511.01408 Preprint, arXiv:1511.01408 [math.FA] (2015). MSC: 47A10 47A55 47A53 47B40 BibTeX Cite \textit{B. P. Duggal}, ``Compact perturbations and consequent hereditarily polaroid operators'', Preprint, arXiv:1511.01408 [math.FA] (2015) Full Text: arXiv OA License
Duggal, B. P.; Djordjević, S. V.; Jeon, I. H. A Putnam-Fuglede commutativity theorem for class \(\mathcal {A}\) operators. (English) Zbl 1342.47031 Rend. Circ. Mat. Palermo (2) 63, No. 3, 355-362 (2014). Reviewer: Michal Zajac (Bratislava) MSC: 47B20 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal} et al., Rend. Circ. Mat. Palermo (2) 63, No. 3, 355--362 (2014; Zbl 1342.47031) Full Text: DOI
Duggal, B. P.; Kubrusly, C. S. PF property and property \((\beta )\) for paranormal operators. (English) Zbl 1336.47025 Rend. Circ. Mat. Palermo (2) 63, No. 1, 129-140 (2014); erratum ibid. 64, No. 1, 167-170 (2015). Reviewer: Michal Zajac (Bratislava) MSC: 47B20 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{C. S. Kubrusly}, Rend. Circ. Mat. Palermo (2) 63, No. 1, 129--140 (2014; Zbl 1336.47025) Full Text: DOI
Duggal, B. P.; Kubrusly, C. S. A Putnam-Fuglede commutativity property for Hilbert space operators. (English) Zbl 1307.47036 Linear Algebra Appl. 458, 108-115 (2014). Reviewer: Farida Lombarkia (Batna) MSC: 47B47 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{C. S. Kubrusly}, Linear Algebra Appl. 458, 108--115 (2014; Zbl 1307.47036) Full Text: DOI
Duggal, B. P.; Djordjević, S. V.; Kubrusly, C. S. Elementary operators, finite ascent, range closure and compactness. (English) Zbl 1308.47044 Linear Algebra Appl. 449, 334-349 (2014). Reviewer: Farida Lombarkia (Batna) MSC: 47B47 47B20 47A10 47A12 PDFBibTeX XMLCite \textit{B. P. Duggal} et al., Linear Algebra Appl. 449, 334--349 (2014; Zbl 1308.47044) Full Text: DOI
Djordjević, Dragan S.; Duggal, Bhagwati P.; Harte, Robin E. Consistent in invertibility operators and SVEP. (English) Zbl 1324.47040 Filomat 27, No. 5, 767-776 (2013). MSC: 47B20 47A10 47A11 PDFBibTeX XMLCite \textit{D. S. Djordjević} et al., Filomat 27, No. 5, 767--776 (2013; Zbl 1324.47040) Full Text: DOI
Duggal, Bhagwati P.; Jeon, In; Kim, In Upper triangular operator matrices, asymptotic intertwining and Browder, Weyl theorems. (English) Zbl 1303.47047 J. Inequal. Appl. 2013, Paper No. 268, 12 p. (2013). Reviewer: Mohamed Zohry (Tétouan) MSC: 47B40 47A10 47B47 47A11 PDFBibTeX XMLCite \textit{B. P. Duggal} et al., J. Inequal. Appl. 2013, Paper No. 268, 12 p. (2013; Zbl 1303.47047) Full Text: DOI
Duggal, B. P. Upper triangular matrix operators with diagonal \((T_1,T_2)\), \(T_2\) \(k\)-nilpotent. (English) Zbl 1295.47013 Rend. Circ. Mat. Palermo (2) 62, No. 2, 215-226 (2013). Reviewer: Masoumeh Faghih-Ahmadi (Shiraz) MSC: 47B20 47B47 47A10 47A16 47B40 PDFBibTeX XMLCite \textit{B. P. Duggal}, Rend. Circ. Mat. Palermo (2) 62, No. 2, 215--226 (2013; Zbl 1295.47013) Full Text: DOI
Duggal, B. P.; Müller, Vladimir Tensor product of left \(n\)-invertible operators. (English) Zbl 1273.47037 Stud. Math. 215, No. 2, 113-125 (2013). MSC: 47A80 47A10 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{V. Müller}, Stud. Math. 215, No. 2, 113--125 (2013; Zbl 1273.47037) Full Text: DOI
Duggal, B. P. Asymptotic intertwining by the identity operator and permanence of spectral properties. (English) Zbl 1287.47003 Banach J. Math. Anal. 7, No. 1, 186-195 (2013). Reviewer: Carlos R. Carpintero (Cumaná) MSC: 47A11 47B10 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal}, Banach J. Math. Anal. 7, No. 1, 186--195 (2013; Zbl 1287.47003) Full Text: DOI Euclid
Boasso, Enrico; Duggal, B. P. Property \((gw)\) for tensor product and left-right multiplication operators. (English) Zbl 1299.47039 Acta Sci. Math. 78, No. 3-4, 589-607 (2012). Reviewer: Martin Mathieu (Belfast) MSC: 47A80 47A53 47A10 47B47 PDFBibTeX XMLCite \textit{E. Boasso} and \textit{B. P. Duggal}, Acta Sci. Math. 78, No. 3--4, 589--607 (2012; Zbl 1299.47039) Full Text: arXiv
Duggal, B. P. Tensor product of \(n\)-isometries. III. (English) Zbl 1289.47042 Funct. Anal. Approx. Comput. 4, No. 2, 61-67 (2012). MSC: 47A80 47A10 47A05 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal}, Funct. Anal. Approx. Comput. 4, No. 2, 61--67 (2012; Zbl 1289.47042) Full Text: Link
Duggal, B. P. Erratum to: Tensor products, asymptotic intertwinings and property \((R)\). (English) Zbl 1253.47014 Rend. Circ. Mat. Palermo (2) 61, No. 1, 151 (2012). MSC: 47A80 47A11 47A10 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal}, Rend. Circ. Mat. Palermo (2) 61, No. 1, 151 (2012; Zbl 1253.47014) Full Text: DOI
Boasso, Enrico; Duggal, B. P. Generalized Browder’s theorem for tensor product and elementary operators. (English) Zbl 1275.47042 J. Math. Anal. Appl. 396, No. 2, 618-624 (2012). Reviewer: Farida Lombarkia (Batna) MSC: 47A80 47A53 47A10 47B47 PDFBibTeX XMLCite \textit{E. Boasso} and \textit{B. P. Duggal}, J. Math. Anal. Appl. 396, No. 2, 618--624 (2012; Zbl 1275.47042) Full Text: DOI arXiv
Duggal, B. P. Tensor product of \(n\)-isometries. (English) Zbl 1295.47010 Linear Algebra Appl. 437, No. 1, 307-318 (2012). Reviewer: Dumitrŭ Popa (Constanţa) MSC: 47A80 47A10 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal}, Linear Algebra Appl. 437, No. 1, 307--318 (2012; Zbl 1295.47010) Full Text: DOI
Duggal, B. P.; Jeon, I. H.; Kim, I. H. On quasi-class \(\mathcal A\) contractions. (English) Zbl 1276.47027 Linear Algebra Appl. 436, No. 9, 3562-3567 (2012). Reviewer: Eungil Ko (Seoul) MSC: 47B20 47A10 PDFBibTeX XMLCite \textit{B. P. Duggal} et al., Linear Algebra Appl. 436, No. 9, 3562--3567 (2012; Zbl 1276.47027) Full Text: DOI
Duggal, Bhagwati P.; Jeon, In Ho; Kim, In Hyoun On \(\ast\)-paranormal contractions and properties for \(\ast\)-class \(A\) operators. (English) Zbl 1234.47008 Linear Algebra Appl. 436, No. 5, 954-962 (2012). MSC: 47B20 47A10 47A80 PDFBibTeX XMLCite \textit{B. P. Duggal} et al., Linear Algebra Appl. 436, No. 5, 954--962 (2012; Zbl 1234.47008) Full Text: DOI
Kim, In Hyoun; Duggal, B. P.; Jeon, In Ho On quasi-class \(\mathcal{A}\) operators. (English) Zbl 1516.47039 Korean J. Math. 19, No. 2, 205-209 (2011). MSC: 47B20 PDFBibTeX XMLCite \textit{I. H. Kim} et al., Korean J. Math. 19, No. 2, 205--209 (2011; Zbl 1516.47039) Full Text: DOI
Kubrusly, C. S.; Duggal, B. P. Quasi-similar \(k\)-paranormal operators. (English) Zbl 1257.47024 Oper. Matrices 5, No. 3, 417-423 (2011). Reviewer: Mohammed Hichem Mortad (Oran) MSC: 47B20 47A45 PDFBibTeX XMLCite \textit{C. S. Kubrusly} and \textit{B. P. Duggal}, Oper. Matrices 5, No. 3, 417--423 (2011; Zbl 1257.47024) Full Text: DOI Link
Chō, Muneo; Djordjević, Slavisa; Duggal, Bhaggy Bishop’s property \((\beta)\) and an elementary operator. (English) Zbl 1228.47036 Hokkaido Math. J. 40, No. 3, 337-356 (2011). MSC: 47B47 47B10 47A10 47B40 PDFBibTeX XMLCite \textit{M. Chō} et al., Hokkaido Math. J. 40, No. 3, 337--356 (2011; Zbl 1228.47036) Full Text: DOI Euclid
Duggal, B. P. Quantum effects, sequential independence and majorization. (English) Zbl 1227.47009 Linear Algebra Appl. 435, No. 12, 3014-3023 (2011). Reviewer: Şafak Alpay (Ankara) MSC: 47B15 47B65 81P15 PDFBibTeX XMLCite \textit{B. P. Duggal}, Linear Algebra Appl. 435, No. 12, 3014--3023 (2011; Zbl 1227.47009) Full Text: DOI
Chō, Muneo; Duggal, Bhaggy P.; Harte, Robin; Ôta, Schôichi Operator equation \(AB=\lambda BA\). (English) Zbl 1244.47021 Int. Math. Forum 5, No. 53-56, 2629-2637 (2010). Reviewer: Edward L. Pekarev (Odessa) MSC: 47B15 47B20 PDFBibTeX XMLCite \textit{M. Chō} et al., Int. Math. Forum 5, No. 53--56, 2629--2637 (2010; Zbl 1244.47021) Full Text: Link
Chō, M.; Djordjević, S. V.; Duggal, B. P.; Yamazaki, T. On an elementary operator with \(w\)-hyponormal operator entries. (English) Zbl 1202.47037 Linear Algebra Appl. 433, No. 11-12, 2070-2079 (2010). Reviewer: Janko Bračič (Ljubljana) MSC: 47B47 47B20 47B49 PDFBibTeX XMLCite \textit{M. Chō} et al., Linear Algebra Appl. 433, No. 11--12, 2070--2079 (2010; Zbl 1202.47037) Full Text: DOI
Duggal, Bhaggy; Harte, Robin; Kim, An-Hyun Weyl’s theorem, tensor products and multiplication operators. II. (English) Zbl 1197.47050 Glasg. Math. J. 52, No. 3, 705-709 (2010). MSC: 47B47 47A10 47A11 PDFBibTeX XMLCite \textit{B. Duggal} et al., Glasg. Math. J. 52, No. 3, 705--709 (2010; Zbl 1197.47050) Full Text: DOI
Boasso, E.; Duggal, B. P.; Jeon, I. H. Generalized Browder’s and Weyl’s theorems for left and right multiplication operators. (English) Zbl 1202.47004 J. Math. Anal. Appl. 370, No. 2, 461-471 (2010). Reviewer: Janko Bračič (Ljubljana) MSC: 47A10 47B47 PDFBibTeX XMLCite \textit{E. Boasso} et al., J. Math. Anal. Appl. 370, No. 2, 461--471 (2010; Zbl 1202.47004) Full Text: DOI arXiv
Duggal, B. P. Finite intertwinings and subscalarity. (English) Zbl 1200.47007 Oper. Matrices 4, No. 2, 257-271 (2010). Reviewer: Janko Bračič (Ljubljana) MSC: 47A11 47B20 47A10 47B40 PDFBibTeX XMLCite \textit{B. P. Duggal}, Oper. Matrices 4, No. 2, 257--271 (2010; Zbl 1200.47007) Full Text: DOI Link
Kubrusly, C. S.; Duggal, B. P. A note on \(k\)-paranormal operators. (English) Zbl 1197.47037 Oper. Matrices 4, No. 2, 213-223 (2010). Reviewer: Woo Young Lee (Seoul) MSC: 47B20 47A05 PDFBibTeX XMLCite \textit{C. S. Kubrusly} and \textit{B. P. Duggal}, Oper. Matrices 4, No. 2, 213--223 (2010; Zbl 1197.47037) Full Text: DOI Link
Duggal, Bhagwati Prashad Upper triangular operators with SVEP. (English) Zbl 1238.47003 J. Korean Math. Soc. 47, No. 2, 235-246 (2010). Reviewer: Janko Bračič (Ljubljana) MSC: 47A10 47A11 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal}, J. Korean Math. Soc. 47, No. 2, 235--246 (2010; Zbl 1238.47003) Full Text: DOI
Duggal, B. P.; Djordjević, S. V.; Chõ, M. The Browder and Weyl spectra of an operator and its diagonal. (English) Zbl 1289.47074 Funct. Anal. Approx. Comput. 1, No. 2, 7-18 (2009). Reviewer: Mohammad Sal Moslehian (Mashhad) MSC: 47B47 47A10 47A11 PDFBibTeX XMLCite \textit{B. P. Duggal} et al., Funct. Anal. Approx. Comput. 1, No. 2, 7--18 (2009; Zbl 1289.47074)
Duggal, Bhagwati Prashad On self-commutator approximates. (English) Zbl 1188.47027 Kyungpook Math. J. 49, No. 1, 1-6 (2009). Reviewer: Janko Bračič (Ljubljana) MSC: 47B47 47B10 47A30 47B48 PDFBibTeX XMLCite \textit{B. P. Duggal}, Kyungpook Math. J. 49, No. 1, 1--6 (2009; Zbl 1188.47027) Full Text: DOI
Duggal, B. P. Perturbations of operators satisfying a local growth condition. (English) Zbl 1163.47007 Extr. Math. 23, No. 1, 29-42 (2008). Reviewer: Chrysoula G. Kokologiannaki (Patras) MSC: 47A55 47B47 47A10 47A11 PDFBibTeX XMLCite \textit{B. P. Duggal}, Extr. Math. 23, No. 1, 29--42 (2008; Zbl 1163.47007) Full Text: EuDML
Duggal, B. P. An elementary operator with log-hyponormal, \(p\)-hyponormal entries. (English) Zbl 1140.47024 Linear Algebra Appl. 428, No. 4, 1109-1116 (2008). Reviewer: Aleksej Turnšek (Ljubljana) MSC: 47B47 47B10 47A10 47B40 PDFBibTeX XMLCite \textit{B. P. Duggal}, Linear Algebra Appl. 428, No. 4, 1109--1116 (2008; Zbl 1140.47024) Full Text: DOI
Duggal, B. P. Upper triangular operators with SVEP: spectral properties. (English) Zbl 1273.47010 Filomat 21, No. 1, 25-37 (2007). MSC: 47A10 47A66 47B20 47B35 PDFBibTeX XMLCite \textit{B. P. Duggal}, Filomat 21, No. 1, 25--37 (2007; Zbl 1273.47010) Full Text: DOI
Duggal, Bhagwati P.; Kubrusly, Carlos S. Weyl’s theorem for direct sums. (English) Zbl 1164.47019 Stud. Sci. Math. Hung. 44, No. 2, 275-290 (2007). Reviewer: Vladimir S. Pilidi (Rostov-on-Donu) MSC: 47A53 47B20 47A10 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{C. S. Kubrusly}, Stud. Sci. Math. Hung. 44, No. 2, 275--290 (2007; Zbl 1164.47019) Full Text: DOI
Duggal, B. P. A generalized commutativity theorems for PK-quasihyponormal operators. (English) Zbl 1267.47034 Filomat 21, No. 2, 77-83 (2007). MSC: 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal}, Filomat 21, No. 2, 77--83 (2007; Zbl 1267.47034) Full Text: DOI
Kubrusly, C. S.; Duggal, B. P. On posinormal operators. (English) Zbl 1146.47011 Adv. Math. Sci. Appl. 17, No. 1, 131-147 (2007). Reviewer: Ömer Gök (Istanbul) MSC: 47B20 47A15 PDFBibTeX XMLCite \textit{C. S. Kubrusly} and \textit{B. P. Duggal}, Adv. Math. Sci. Appl. 17, No. 1, 131--147 (2007; Zbl 1146.47011)
Duggal, B. P. Spectral continuity of \(k\)-th-roots of hyponormal operators. (English) Zbl 1148.47017 Oper. Matrices 1, No. 2, 209-215 (2007). Reviewer: Abdellatif Bourhim (Québec) MSC: 47B20 47A10 47A11 PDFBibTeX XMLCite \textit{B. P. Duggal}, Oper. Matrices 1, No. 2, 209--215 (2007; Zbl 1148.47017) Full Text: DOI
Duggal, B. P. Polaroid operators, SVEP and perturbed Browder, Weyl theorems. (English) Zbl 1196.47030 Rend. Circ. Mat. Palermo (2) 56, No. 3, 317-330 (2007). MSC: 47B47 47A10 47A11 PDFBibTeX XMLCite \textit{B. P. Duggal}, Rend. Circ. Mat. Palermo (2) 56, No. 3, 317--330 (2007; Zbl 1196.47030) Full Text: DOI
Duggal, Bhagwati P. SVEP and generalized Weyl’s theorem. (English) Zbl 1145.47003 Mediterr. J. Math. 4, No. 3, 309-320 (2007). Reviewer: Andrzej Sołtysiak (Poznań) MSC: 47A10 47A12 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal}, Mediterr. J. Math. 4, No. 3, 309--320 (2007; Zbl 1145.47003) Full Text: DOI
Duggal, B. P. Paranormal and \((p,k)\)-quasihyponormal operators: spectral continuity. (English) Zbl 1150.47012 Rend. Circ. Mat. Palermo (2) 56, No. 1, 57-64 (2007). Reviewer: Takeaki Yamazaki (Yokohama) MSC: 47B20 47A10 47A11 PDFBibTeX XMLCite \textit{B. P. Duggal}, Rend. Circ. Mat. Palermo (2) 56, No. 1, 57--64 (2007; Zbl 1150.47012) Full Text: DOI
Duggal, B. P. Perturbations and Weyl’s theorem. (English) Zbl 1126.47002 Proc. Am. Math. Soc. 135, No. 9, 2899-2905 (2007). Reviewer: Pei Yuan Wu (Hsinchu) MSC: 47A10 47A12 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal}, Proc. Am. Math. Soc. 135, No. 9, 2899--2905 (2007; Zbl 1126.47002) Full Text: DOI
Duggal, B. P.; Jeon, In Ho On \(p\)-quasi-hyponormal operators. (English) Zbl 1123.47020 Linear Algebra Appl. 422, No. 1, 331-340 (2007). Reviewer: Eungil Ko (Seoul) MSC: 47B20 47A10 47A11 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Jeon}, Linear Algebra Appl. 422, No. 1, 331--340 (2007; Zbl 1123.47020) Full Text: DOI
Duggal, B. P.; Djordjević, S. V. Generalised Weyl’s theorem for a class of operators satisfying a norm condition. II. (English) Zbl 1131.47004 Math. Proc. R. Ir. Acad. 106A, No. 1, 1-9 (2006). Reviewer: Abdellatif Bourhim (Québec) MSC: 47A10 47B20 47A53 47A12 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{S. V. Djordjević}, Math. Proc. R. Ir. Acad. 106A, No. 1, 1--9 (2006; Zbl 1131.47004) Full Text: DOI
Canavati, Jose Angel; Djordjević, Slavisa V.; Duggal, Bhagwati Prasad On the range closure of an elementary operator. (English) Zbl 1142.47022 Bull. Korean Math. Soc. 43, No. 4, 671-677 (2006). Reviewer: Martin Mathieu (Belfast) MSC: 47B47 47A10 47A11 PDFBibTeX XMLCite \textit{J. A. Canavati} et al., Bull. Korean Math. Soc. 43, No. 4, 671--677 (2006; Zbl 1142.47022) Full Text: DOI
Duggal, Bhagwati P.; Jeon, In Ho; Kim, In Hyoun On Weyl’s theorem for quasi-class \(A\) operators. (English) Zbl 1133.47009 J. Korean Math. Soc. 43, No. 4, 899-909 (2006). Reviewer: Woo Young Lee (Seoul) MSC: 47A53 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal} et al., J. Korean Math. Soc. 43, No. 4, 899--909 (2006; Zbl 1133.47009) Full Text: DOI
Duggal, B. P. Polaroid operators satisfying Weyl’s theorem. (English) Zbl 1096.47039 Linear Algebra Appl. 414, No. 1, 271-277 (2006). Reviewer: Armando R. Villena (Granada) MSC: 47B47 47A10 47A11 PDFBibTeX XMLCite \textit{B. P. Duggal}, Linear Algebra Appl. 414, No. 1, 271--277 (2006; Zbl 1096.47039) Full Text: DOI
Duggal, B. P. A perturbed elementary operator and range-kernel orthogonality. (English) Zbl 1082.47031 Proc. Am. Math. Soc. 134, No. 6, 1727-1734 (2006). MSC: 47B47 47B10 47A10 47B40 47A30 PDFBibTeX XMLCite \textit{B. P. Duggal}, Proc. Am. Math. Soc. 134, No. 6, 1727--1734 (2006; Zbl 1082.47031) Full Text: DOI
Aiena, Pietro; Duggal, B. P. Tensor products, multiplications and Weyl’s theorem. (English) Zbl 1123.47018 Rend. Circ. Mat. Palermo (2) 54, No. 3, 387-395 (2005). Reviewer: Michal Zajac (Bratislava) MSC: 47A80 47A10 47A11 47B47 PDFBibTeX XMLCite \textit{P. Aiena} and \textit{B. P. Duggal}, Rend. Circ. Mat. Palermo (2) 54, No. 3, 387--395 (2005; Zbl 1123.47018) Full Text: DOI
Duggal, B. P.; Djordjević, Slavisa V. Operator matrices: SVEP and Weyl’s theorem. (English) Zbl 1123.47007 Mediterr. J. Math. 2, No. 4, 395-406 (2005). Reviewer: Timothy Feeman (Villanova) MSC: 47A10 47A11 47A53 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{S. V. Djordjević}, Mediterr. J. Math. 2, No. 4, 395--406 (2005; Zbl 1123.47007) Full Text: DOI
Duggal, B. P.; Kubrusly, C. S. Totally hereditarily normaloid operators and Weyl’s theorem for an elementary operator. (English) Zbl 1087.47026 J. Math. Anal. Appl. 312, No. 2, 502-513 (2005). Reviewer: Armando R. Villena (Granada) MSC: 47B20 47B47 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{C. S. Kubrusly}, J. Math. Anal. Appl. 312, No. 2, 502--513 (2005; Zbl 1087.47026) Full Text: DOI
Duggal, Bhagwati; Jeon, In Ho; Ko, Eungil \(k\)-th roots of \(p\)-hyponormal operators. (English) Zbl 1080.47022 Bull. Korean Math. Soc. 42, No. 3, 571-577 (2005). Reviewer: Abdellatif Bourhim (Québec) MSC: 47B20 47A10 47B40 47A15 PDFBibTeX XMLCite \textit{B. Duggal} et al., Bull. Korean Math. Soc. 42, No. 3, 571--577 (2005; Zbl 1080.47022) Full Text: DOI
Duggal, Bhagwati P.; Jeon, In Ho Remarks on spectral properties of \(p\)-hyponormal and log-hyponormal operators. (English) Zbl 1080.47021 Bull. Korean Math. Soc. 42, No. 3, 543-554 (2005). Reviewer: Abdellatif Bourhim (Québec) MSC: 47B20 47A10 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Jeon}, Bull. Korean Math. Soc. 42, No. 3, 543--554 (2005; Zbl 1080.47021) Full Text: DOI
Duggal, B. P.; Djordjević, S. V.; Kubrusly, C. S. Hereditarily normaloid contractions. (English) Zbl 1106.47016 Acta Sci. Math. 71, No. 1-2, 337-352 (2005). Reviewer: Danuta Przeworska Rolewicz (Warszawa) MSC: 47A45 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal} et al., Acta Sci. Math. 71, No. 1--2, 337--352 (2005; Zbl 1106.47016)
Duggal, B. P. Riesz projections for a class of Hilbert space operators. (English) Zbl 1081.47024 Linear Algebra Appl. 407, 140-148 (2005). Reviewer: Shanli Sun (Beijing) MSC: 47B20 47A10 47A11 PDFBibTeX XMLCite \textit{B. P. Duggal}, Linear Algebra Appl. 407, 140--148 (2005; Zbl 1081.47024) Full Text: DOI
Duggal, B. P.; Djordjević, S. V.; Kubrusly, Carlos Kato type operators and Weyl’s theorem. (English) Zbl 1087.47003 J. Math. Anal. Appl. 309, No. 2, 433-441 (2005). Reviewer: Takeaki Yamazaki (Yokohama) MSC: 47A10 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal} et al., J. Math. Anal. Appl. 309, No. 2, 433--441 (2005; Zbl 1087.47003) Full Text: DOI
Duggal, B. P. Subspace gaps and Weyl’s theorem for an elementary operator. (English) Zbl 1126.47033 Int. J. Math. Math. Sci. 2005, No. 3, 465-474 (2005). Reviewer: Matej Brešar (Maribor) MSC: 47B47 47A10 PDFBibTeX XMLCite \textit{B. P. Duggal}, Int. J. Math. Math. Sci. 2005, No. 3, 465--474 (2005; Zbl 1126.47033) Full Text: DOI EuDML
Duggal, Bhagwati Prashad; Kubrusly, Carlos Weyl’s theorems for posinormal operators. (English) Zbl 1085.47044 J. Korean Math. Soc. 42, No. 3, 529-541 (2005). Reviewer: Abdellatif Bourhim (Québec) MSC: 47B47 47A10 47A11 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{C. Kubrusly}, J. Korean Math. Soc. 42, No. 3, 529--541 (2005; Zbl 1085.47044) Full Text: DOI
Duggal, B. P. On the range closure of an elementary operator. (English) Zbl 1079.47037 Linear Algebra Appl. 402, 199-206 (2005). Reviewer: M. Brešar (Maribor) MSC: 47B47 47B10 47A10 47B40 PDFBibTeX XMLCite \textit{B. P. Duggal}, Linear Algebra Appl. 402, 199--206 (2005; Zbl 1079.47037) Full Text: DOI
Duggal, B. P.; Kubrusly, C. S.; Levan, N. Contractions of class \(\mathcal Q\) and invariant subspaces. (English) Zbl 1085.47010 Bull. Korean Math. Soc. 42, No. 1, 169-177 (2005). Reviewer: Mihai Putinar (Santa Barbara) MSC: 47A15 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal} et al., Bull. Korean Math. Soc. 42, No. 1, 169--177 (2005; Zbl 1085.47010) Full Text: DOI
Duggal, B. P.; Jeon, In Ho On \(n\)-tuples of tensor products of \(p\)-hyponormal operators. (English) Zbl 1184.47007 J. Korea Soc. Math. Educ., Ser. B, Pure Appl. Math. 11, No. 4, 287-292 (2004). MSC: 47B20 47A13 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{I. H. Jeon}, J. Korean Soc. Math. Educ., Ser. B, Pure Appl. Math. 11, No. 4, 287--292 (2004; Zbl 1184.47007)
Duggal, B. P. Weyl’s theorem for totally hereditarily normaloid operators. (English) Zbl 1096.47038 Rend. Circ. Mat. Palermo, II. Ser. 53, No. 3, 417-428 (2004). Reviewer: Vladimir V. Kisil (Leeds) MSC: 47B47 47A10 47A11 PDFBibTeX XMLCite \textit{B. P. Duggal}, Rend. Circ. Mat. Palermo (2) 53, No. 3, 417--428 (2004; Zbl 1096.47038) Full Text: DOI
Duggal, B. P.; Djordjević, S. V. Generalised Weyl’s theorem for a class of operators satisfying a norm condition. (English) Zbl 1089.47005 Math. Proc. R. Ir. Acad. 104A, No. 1, 75-81 (2004). Reviewer: Abdellatif Bourhim (Québec) MSC: 47A10 47A53 47A12 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{S. V. Djordjević}, Math. Proc. R. Ir. Acad. 104A, No. 1, 75--81 (2004; Zbl 1089.47005) Full Text: DOI
Duggal, B. P.; Kubrusly, C. S. Paranormal contractions have property PF. (English) Zbl 1084.47006 Far East J. Math. Sci. (FJMS) 14, No. 2, 237-249 (2004). Reviewer: Wang Gongbao (Wuhan) MSC: 47A45 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{C. S. Kubrusly}, Far East J. Math. Sci. (FJMS) 14, No. 2, 237--249 (2004; Zbl 1084.47006)
Duggal, B. P.; Harte, Robin E. Range-kernel orthogonality and range closure of an elementary operator. (English) Zbl 1083.47029 Monatsh. Math. 143, No. 3, 179-187 (2004). Reviewer: Aleksej Turnšek (Ljubljana) MSC: 47B47 47B10 47A10 46E30 47B20 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{R. E. Harte}, Monatsh. Math. 143, No. 3, 179--187 (2004; Zbl 1083.47029) Full Text: DOI
Duggal, B. P. The closure of the range of an elementary operator. (English) Zbl 1087.47040 Linear Algebra Appl. 392, 305-319 (2004). Reviewer: Sergej V. Kislyakov (St. Peterburg) MSC: 47B47 47B10 47A10 47B40 PDFBibTeX XMLCite \textit{B. P. Duggal}, Linear Algebra Appl. 392, 305--319 (2004; Zbl 1087.47040) Full Text: DOI
Duggal, B. P.; Djordjević, S. V. Weyl’s theorem through finite ascent property. (English) Zbl 1085.47043 Bol. Soc. Mat. Mex., III. Ser. 10, No. 1, 139-147 (2004). Reviewer: Andrzej Sołtysiak (Poznań) MSC: 47B47 47A10 47A11 PDFBibTeX XMLCite \textit{B. P. Duggal} and \textit{S. V. Djordjević}, Bol. Soc. Mat. Mex., III. Ser. 10, No. 1, 139--147 (2004; Zbl 1085.47043)