Chien, Mao-Ting; Nakazato, Hiroshi Joint numerical range with degenerate boundary generating variety. (English) Zbl 07777055 Adv. Oper. Theory 8, No. 4, Paper No. 72, 22 p. (2023). Reviewer: Jorma K. Merikoski (Tampere) MSC: 15A60 15A63 15B57 47A12 11E20 14H52 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Adv. Oper. Theory 8, No. 4, Paper No. 72, 22 p. (2023; Zbl 07777055) Full Text: DOI
Chien, Mao-Ting; Kirkland, Steve; Li, Chi-Kwong; Nakazato, Hiroshi Numerical ranges of cyclic shift matrices. (English) Zbl 07757996 Linear Algebra Appl. 678, 268-294 (2023). MSC: 15A60 15A18 47A12 05B20 PDFBibTeX XMLCite \textit{M.-T. Chien} et al., Linear Algebra Appl. 678, 268--294 (2023; Zbl 07757996) Full Text: DOI arXiv
Chien, Mao-Ting; Nakazato, Hiroshi Theta divisor and Abel map for 4-by-4 matrices. (English) Zbl 07734089 Linear Algebra Appl. 676, 296-317 (2023). MSC: 14K25 14H42 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 676, 296--317 (2023; Zbl 07734089) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Elliptic modular invariants of 4-by-4 matrices. (English) Zbl 1506.11054 Linear Algebra Appl. 662, 49-66 (2023). MSC: 11E20 14H52 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 662, 49--66 (2023; Zbl 1506.11054) Full Text: DOI
Itzá-Ortiz, Benjamín A.; Martínez-Avendaño, Rubén A.; Nakazato, Hiroshi The numerical range of periodic banded Toeplitz operators. arXiv:2308.12353 Preprint, arXiv:2308.12353 [math.FA] (2023). MSC: 47A12 15A60 BibTeX Cite \textit{B. A. Itzá-Ortiz} et al., ``The numerical range of periodic banded Toeplitz operators'', Preprint, arXiv:2308.12353 [math.FA] (2023) Full Text: arXiv OA License
Chien, Mao-Ting; Nakazato, Hiroshi Computing real definite representations of Helton-Vinnikov theorem. (English) Zbl 1478.15032 Banach J. Math. Anal. 16, No. 2, Paper No. 19, 20 p. (2022). MSC: 15A60 47A12 15A15 14H42 14Q05 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Banach J. Math. Anal. 16, No. 2, Paper No. 19, 20 p. (2022; Zbl 1478.15032) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Inverse numerical range and Abel-Jacobi map of Hermitian determinantal representation. (English) Zbl 1503.15030 Linear Algebra Appl. 633, 227-243 (2022). MSC: 15A60 47A12 15B57 14H52 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 633, 227--243 (2022; Zbl 1503.15030) Full Text: DOI
Itzá-Ortiz, Benjamín A.; Martínez-Avendaño, Rubén A.; Nakazato, Hiroshi The numerical range of some periodic tridiagonal operators is the convex hull of the numerical ranges of two finite matrices. (English) Zbl 07432539 Linear Multilinear Algebra 69, No. 15, 2830-2849 (2021). Reviewer: Agnes Radl (Fulda) MSC: 47A12 47B36 15A60 PDFBibTeX XMLCite \textit{B. A. Itzá-Ortiz} et al., Linear Multilinear Algebra 69, No. 15, 2830--2849 (2021; Zbl 07432539) Full Text: DOI arXiv
Chien, Mao-Ting; Nakazato, Hiroshi Abel theorem and inverse numerical range. (English) Zbl 1467.14145 Linear Algebra Appl. 626, 20-33 (2021). MSC: 14Q05 14C25 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 626, 20--33 (2021; Zbl 1467.14145) Full Text: DOI
Chien, Mao-Ting; Li, Chi-Kwong; Nakazato, Hiroshi The diameter and width of higher rank numerical ranges. (English) Zbl 1462.15026 Linear Multilinear Algebra 69, No. 5, 871-887 (2021). MSC: 15A60 52A10 47A12 PDFBibTeX XMLCite \textit{M.-T. Chien} et al., Linear Multilinear Algebra 69, No. 5, 871--887 (2021; Zbl 1462.15026) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Unitary similarity of a weighted shift matrix to a symmetric matrix. (English) Zbl 1458.15062 Linear Algebra Appl. 611, 356-364 (2021). MSC: 15B99 15A60 47B25 47A12 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 611, 356--364 (2021; Zbl 1458.15062) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi; Moslehian, Mohammad Sal; Zamani, Ali Generating curves of the inverse \(q\)-numerical ranges of 2-by-2 matrices. (English) Zbl 1461.14042 Arch. Math. 115, No. 6, 667-677 (2020). Reviewer: Pietro De Poi (Udine) MSC: 14H50 15A60 15A29 PDFBibTeX XMLCite \textit{M.-T. Chien} et al., Arch. Math. 115, No. 6, 667--677 (2020; Zbl 1461.14042) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Symmetry of cyclic weighted shift matrices with pivot-reversible weights. (English) Zbl 1432.15010 Electron. J. Linear Algebra 36, 47-54 (2020). MSC: 15A21 15A60 47B37 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Electron. J. Linear Algebra 36, 47--54 (2020; Zbl 1432.15010) Full Text: Link
Chien, M. T.; Nakazato, H. Hyperbolic forms admit reversible weighted shift determinantal representation. (English) Zbl 1433.15011 Appl. Math. Comput. 362, Article ID 124595, 17 p. (2019). MSC: 15A15 37J99 65F40 15A60 15A45 PDFBibTeX XMLCite \textit{M. T. Chien} and \textit{H. Nakazato}, Appl. Math. Comput. 362, Article ID 124595, 17 p. (2019; Zbl 1433.15011) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi; Meng, Jie The diameter and width of numerical ranges. (English) Zbl 1436.15024 Linear Algebra Appl. 582, 76-98 (2019). Reviewer: Agnes Radl (Berlin) MSC: 15A60 52A10 15B05 47A12 PDFBibTeX XMLCite \textit{M.-T. Chien} et al., Linear Algebra Appl. 582, 76--98 (2019; Zbl 1436.15024) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Boundary generating curves of quaternionic numerical ranges. (English) Zbl 1414.15026 Linear Algebra Appl. 574, 201-215 (2019). MSC: 15A60 11R52 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 574, 201--215 (2019; Zbl 1414.15026) Full Text: DOI
Huang, Peng-Ruei; Nakazato, Hiroshi Cyclic weighted shift matrix with reversible weights. (English) Zbl 1475.15027 Ann. Funct. Anal. 10, No. 1, 72-80 (2019). Reviewer: Tin Yau Tam (Reno) MSC: 15A60 15A21 15B57 PDFBibTeX XMLCite \textit{P.-R. Huang} and \textit{H. Nakazato}, Ann. Funct. Anal. 10, No. 1, 72--80 (2019; Zbl 1475.15027) Full Text: DOI Euclid
Chien, Mao-Ting; Nakazato, Hiroshi; Yeh, Lina Inverse numerical range and determinantal representation. (English) Zbl 1403.15014 Linear Algebra Appl. 558, 79-100 (2018). Reviewer: Piotr Pokora (Kraków) MSC: 15A60 11E20 15A29 14H52 PDFBibTeX XMLCite \textit{M.-T. Chien} et al., Linear Algebra Appl. 558, 79--100 (2018; Zbl 1403.15014) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Symmetric representation of ternary forms associated to some Toeplitz matrices. (English) Zbl 1392.15012 Symmetry 10, No. 3, Article ID 55, 13 p. (2018). MSC: 15A15 15B05 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Symmetry 10, No. 3, Article ID 55, 13 p. (2018; Zbl 1392.15012) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Determinantal representations of elliptic curves via Weierstrass elliptic functions. (English) Zbl 1391.33041 Electron. J. Linear Algebra 34, 125-136 (2018). MSC: 33E05 14H52 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Electron. J. Linear Algebra 34, 125--136 (2018; Zbl 1391.33041)
Chien, Mao-Ting; Nakazato, Hiroshi Unitary similarity of the determinantal representation of unitary bordering matrices. (English) Zbl 1439.11106 Linear Algebra Appl. 541, 13-35 (2018). MSC: 11E20 14K25 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 541, 13--35 (2018; Zbl 1439.11106) Full Text: DOI
Chien, Mao-Ting; Liu, Jianzhen; Nakazato, Hiroshi; Tam, Tin-Yau Toeplitz matrices are unitarily similar to symmetric matrices. (English) Zbl 1387.15030 Linear Multilinear Algebra 65, No. 10, 2131-2144 (2017). MSC: 15B05 15A15 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} et al., Linear Multilinear Algebra 65, No. 10, 2131--2144 (2017; Zbl 1387.15030) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Reducibility of the ternary forms of unitary bordering matrices. (English) Zbl 1365.15029 Linear Algebra Appl. 527, 73-86 (2017). MSC: 15A60 11E20 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 527, 73--86 (2017; Zbl 1365.15029) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Computation of Riemann matrices for the hyperbolic curves of determinantal polynomials. (English) Zbl 1360.15024 Ann. Funct. Anal. 8, No. 2, 152-167 (2017). MSC: 15A60 15B57 15A15 14H42 14K25 15B05 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Ann. Funct. Anal. 8, No. 2, 152--167 (2017; Zbl 1360.15024) Full Text: DOI Euclid
Chien, Mao-Ting; Nakazato, Hiroshi Singular points of the algebraic curves associated to unitary bordering matrices. (English) Zbl 1349.14114 Linear Algebra Appl. 513, 224-239 (2017). MSC: 14H20 15A60 14H50 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 513, 224--239 (2017; Zbl 1349.14114) Full Text: DOI
Huang, Peng-Ruei; Nakazato, Hiroshi The boundary of the Q-numerical range of some Toeplitz nilpotent matrix. (English) Zbl 1383.15020 Nihonkai Math. J. 27, No. 1-2, 155-165 (2016). Reviewer: John D. Dixon (Ottawa) MSC: 15A60 PDFBibTeX XMLCite \textit{P.-R. Huang} and \textit{H. Nakazato}, Nihonkai Math. J. 27, No. 1--2, 155--165 (2016; Zbl 1383.15020) Full Text: Euclid
Chien, Mao-Ting; Nakazato, Hiroshi Computing the determinantal representations of hyperbolic forms. (English) Zbl 1413.14005 Czech. Math. J. 66, No. 3, 633-651 (2016). MSC: 14Q05 15A60 14H42 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Czech. Math. J. 66, No. 3, 633--651 (2016; Zbl 1413.14005) Full Text: DOI Link
Chien, M. T.; Nakazato, H. Determinantal representations of hyperbolic forms via weighted shift matrices. (English) Zbl 1338.15048 Appl. Math. Comput. 258, 172-181 (2015). MSC: 15A60 65F99 PDFBibTeX XMLCite \textit{M. T. Chien} and \textit{H. Nakazato}, Appl. Math. Comput. 258, 172--181 (2015; Zbl 1338.15048) Full Text: DOI
Undrakh, Batzorig; Nakazato, Hiroshi; Vandanjav, Adiyasuren; Chien, Mao-Ting The numerical radius of a weighted shift operator. (English) Zbl 1330.47014 Electron. J. Linear Algebra 30, 944-963 (2015). MSC: 47A12 15A60 PDFBibTeX XMLCite \textit{B. Undrakh} et al., Electron. J. Linear Algebra 30, 944--963 (2015; Zbl 1330.47014) Full Text: DOI Link
Chien, Mao-Ting; Nakazato, Hiroshi A new Poncelet curve for the boundary generating curve of a numerical range. (English) Zbl 1327.15045 Linear Algebra Appl. 487, 1-21 (2015). MSC: 15A60 51M04 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 487, 1--21 (2015; Zbl 1327.15045) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Elliptic modular invariants and numerical ranges. (English) Zbl 1314.14056 Linear Multilinear Algebra 63, No. 8, 1501-1519 (2015). Reviewer: Andrea Bandini (Parma) MSC: 14H52 11E20 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Multilinear Algebra 63, No. 8, 1501--1519 (2015; Zbl 1314.14056) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Singular points of the algebraic curves of symmetric hyperbolic forms. (English) Zbl 1326.14069 Linear Algebra Appl. 470, 40-50 (2015). MSC: 14H20 11E20 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 470, 40--50 (2015; Zbl 1326.14069) Full Text: DOI
Chien, M. T.; Nakazato, H. Reduction of joint \(c\)-numerical ranges. (English) Zbl 1410.15043 Appl. Math. Comput. 232, 178-182 (2014). MSC: 15A60 15A45 PDFBibTeX XMLCite \textit{M. T. Chien} and \textit{H. Nakazato}, Appl. Math. Comput. 232, 178--182 (2014; Zbl 1410.15043) Full Text: DOI
Nakazato, Hiroshi; Bebiano, Natália; da Providência, João A note on the convexity of the indefinite joint numerical range. (English) Zbl 1339.47009 Electron. J. Linear Algebra 27, 705-715 (2014). Reviewer: Andrzej Sołtysiak (Poznań) MSC: 47A12 46C20 15A60 PDFBibTeX XMLCite \textit{H. Nakazato} et al., Electron. J. Linear Algebra 27, 705--715 (2014; Zbl 1339.47009) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Numerical range of a nilpotent matrix and related central force. (English) Zbl 1315.15023 Linear Multilinear Algebra 62, No. 5, 595-613 (2014). Reviewer: Wai-Shun Cheung (Hong Kong) MSC: 15A60 70K40 14Q05 15A18 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Multilinear Algebra 62, No. 5, 595--613 (2014; Zbl 1315.15023) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Determinantal representation of trigonometric polynomial curves via Sylvester method. (English) Zbl 1283.15025 Banach J. Math. Anal. 8, No. 1, 269-278 (2014). Reviewer: Arnold Richard Kräuter (Leoben) MSC: 15A15 15A60 47A12 42A05 15B57 15B05 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Banach J. Math. Anal. 8, No. 1, 269--278 (2014; Zbl 1283.15025) Full Text: DOI Euclid Link
Nakazato, Hiroshi; Kovačec, Alexander; Bebiano, Natália; da Providência, João The main diagonal products of \( 3 \times 3\) normal matrices whose eigenvalues are the third roots of unity. (English) Zbl 1298.15042 Fonseca, Carlos (ed.) et al., The Natália Bebiano anniversary volume. Special issue on the occasion of her 60th birthday. Coimbra: Universidade de Coimbra, Departamento de Matemática (ISBN 978-972-8564-48-3/pbk). Textos de Matemática 44, 145-151 (2013). MSC: 15B57 15A60 PDFBibTeX XMLCite \textit{H. Nakazato} et al., Textos Mat. 44, 145--151 (2013; Zbl 1298.15042)
Chien, Mao-Ting; Nakazato, Hiroshi Singular points of cyclic weighted shift matrices. (English) Zbl 1283.15117 Linear Algebra Appl. 439, No. 12, 4090-4100 (2013). MSC: 15B99 14H20 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 439, No. 12, 4090--4100 (2013; Zbl 1283.15117) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Hyperbolic forms associated with cyclic weighted shift matrices. (English) Zbl 1284.15011 Linear Algebra Appl. 439, No. 11, 3541-3554 (2013). MSC: 15A63 15A60 11R09 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 439, No. 11, 3541--3554 (2013; Zbl 1284.15011) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Cubic surfaces and \(q\)-numerical ranges. (English) Zbl 1286.14051 Math. Commun. 18, No. 1, 133-141 (2013). Reviewer: Gerhard Pfister (Kaiserslautern) MSC: 14J17 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Math. Commun. 18, No. 1, 133--141 (2013; Zbl 1286.14051) Full Text: Link
Chien, Mao-Ting; Nakazato, Hiroshi Strict convexity of the joint \(c\)-numerical range. (English) Zbl 1270.15013 Linear Algebra Appl. 438, No. 3, 1305-1321 (2013). Reviewer: Qing-Wen Wang (Shanghai) MSC: 15A60 52A30 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 438, No. 3, 1305--1321 (2013; Zbl 1270.15013) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Singular points of the ternary polynomials associated with 4-by-4 matrices. (English) Zbl 1253.15030 Electron. J. Linear Algebra 23, 755-769 (2012). MSC: 15A60 14H45 15A15 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Electron. J. Linear Algebra 23, 755--769 (2012; Zbl 1253.15030) Full Text: DOI Link
Chien, Mao-Ting; Nakazato, Hiroshi Critical values for higher rank numerical ranges associated with roulette curves. (English) Zbl 1252.15028 Linear Algebra Appl. 437, No. 9, 2117-2127 (2012). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 437, No. 9, 2117--2127 (2012; Zbl 1252.15028) Full Text: DOI
Kitamura, Seiji; Nakazato, Hiroshi Trigonometric polynomials and quartic hyperbolic ternary forms. (English) Zbl 1236.15049 Int. J. Algebra 5, No. 1-4, 159-166 (2011). Reviewer: Pei Yuan Wu (Hsinchu) MSC: 15A60 PDFBibTeX XMLCite \textit{S. Kitamura} and \textit{H. Nakazato}, Int. J. Algebra 5, No. 1--4, 159--166 (2011; Zbl 1236.15049) Full Text: Link
Chien, Mao-Ting; Nakazato, Hiroshi The boundary of higher rank numerical ranges. (English) Zbl 1234.15007 Linear Algebra Appl. 435, No. 11, 2971-2985 (2011). Reviewer: Pei Yuan Wu (Hsinchu) MSC: 15A60 14Q05 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 435, No. 11, 2971--2985 (2011; Zbl 1234.15007) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Construction of determinantal representation of trigonometric polynomials. (English) Zbl 1222.15008 Linear Algebra Appl. 435, No. 6, 1277-1284 (2011). Reviewer: Stamatis Koumandos (Nicosia) MSC: 15A15 42A05 15B57 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 435, No. 6, 1277--1284 (2011; Zbl 1222.15008) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Reduction of the \(c\)-numerical range to the classical numerical range. (English) Zbl 1210.15023 Linear Algebra Appl. 434, No. 3, 615-624 (2011). Reviewer: Pei Yuan Wu (Hsinchu) MSC: 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 434, No. 3, 615--624 (2011; Zbl 1210.15023) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Numerical range for orbits under a central force. (English) Zbl 1245.15023 Math. Phys. Anal. Geom. 13, No. 4, 315-330 (2010). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 70F05 14A05 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Math. Phys. Anal. Geom. 13, No. 4, 315--330 (2010; Zbl 1245.15023) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi The q-numerical range of \(3\times 3\) tridiagonal matrices. (English) Zbl 1207.15024 Electron. J. Linear Algebra 20, 376-390 (2010). MSC: 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Electron. J. Linear Algebra 20, 376--390 (2010; Zbl 1207.15024) Full Text: DOI EuDML EMIS
Bebiano, N.; Nakazato, H.; Nata, A.; Da Providência, J. The boundary of the Krein space tracial numerical range, an algebraic approach and a numerical algorithm. (English) Zbl 1205.15037 Ann. Mat. Pura Appl. (4) 189, No. 4, 539-551 (2010). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 47A12 46C20 65F30 15A63 15B57 PDFBibTeX XMLCite \textit{N. Bebiano} et al., Ann. Mat. Pura Appl. (4) 189, No. 4, 539--551 (2010; Zbl 1205.15037) Full Text: DOI Link
Chien, Mao-Ting; Ko, Chung-Lien; Nakazato, Hiroshi On the numerical ranges of matrix products. (English) Zbl 1192.15009 Appl. Math. Lett. 23, No. 6, 732-737 (2010). Reviewer: Jorma K. Merikoski (Tampere) MSC: 15A60 15B05 15A27 PDFBibTeX XMLCite \textit{M.-T. Chien} et al., Appl. Math. Lett. 23, No. 6, 732--737 (2010; Zbl 1192.15009) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Joint numerical range and its generating hypersurface. (English) Zbl 1185.15021 Linear Algebra Appl. 432, No. 1, 173-179 (2010). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 32S25 15B57 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 432, No. 1, 173--179 (2010; Zbl 1185.15021) Full Text: DOI
Nakazato, Hiroshi The equation of the boundary of the polynomial numerical hull of a matrix. (English) Zbl 1200.15011 J. Algebra Number Theory, Adv. Appl. 2, No. 1, 13-20 (2009). Reviewer: Yiu Tung Poon (Ames) MSC: 15A60 47A12 PDFBibTeX XMLCite \textit{H. Nakazato}, J. Algebra Number Theory, Adv. Appl. 2, No. 1, 13--20 (2009; Zbl 1200.15011)
Bebiano, N.; Nakazato, H.; da Providência, J. On the Courant–Fischer theory for Krein spaces. (English) Zbl 1168.47004 Linear Algebra Appl. 430, No. 7, 1867-1876 (2009). Reviewer: Andreas Fleige (Dortmund) MSC: 47A12 46C20 15A42 PDFBibTeX XMLCite \textit{N. Bebiano} et al., Linear Algebra Appl. 430, No. 7, 1867--1876 (2009; Zbl 1168.47004) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Flat portions on the boundary of the Davis-Wielandt shell of 3-by-3 matrices. (English) Zbl 1155.15031 Linear Algebra Appl. 430, No. 1, 204-214 (2009). Reviewer: Mohammad Sal Moslehian (Mashhad) MSC: 15A60 32S25 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 430, No. 1, 204--214 (2009; Zbl 1155.15031) Full Text: DOI
Kataoka, Nobuo; Nakazato, Hiroshi Computation of the coefficients in perturbation expansions. (English) Zbl 1239.15015 Bull. Grad. Sch. Sci. Technol., Hirosaki Univ. 2, 1-14 (2008). MSC: 15A60 PDFBibTeX XMLCite \textit{N. Kataoka} and \textit{H. Nakazato}, Bull. Grad. Sch. Sci. Technol., Hirosaki Univ. 2, 1--14 (2008; Zbl 1239.15015)
Kimura, Takuma; Nakazato, H. Topological properties of the numerical range of matrix polynomials. (English) Zbl 1176.15031 Int. J. Algebra 2, No. 5-8, 217-221 (2008). Reviewer: Pei Yuan Wu (Hsinchu) MSC: 15A60 47A12 47A56 PDFBibTeX XMLCite \textit{T. Kimura} and \textit{H. Nakazato}, Int. J. Algebra 2, No. 5--8, 217--221 (2008; Zbl 1176.15031) Full Text: Link
Koide, Ryuusuke; Nakazato, Hiroshi The \(q\)-numerical range of a certain \(3\times 3\) matrix. (English) Zbl 1163.15031 Int. Math. Forum 3, No. 21-24, 1001-1010 (2008). Reviewer: Janko Bračič (Ljubljana) MSC: 15A60 PDFBibTeX XMLCite \textit{R. Koide} and \textit{H. Nakazato}, Int. Math. Forum 3, No. 21--24, 1001--1010 (2008; Zbl 1163.15031) Full Text: Link
Chien, Mao-Ting; Nakazato, Hiroshi The \(q\)-numerical range of 3-by-3 weighted shift matrices. (English) Zbl 1158.15027 Appl. Math. Lett. 21, No. 11, 1199-1203 (2008). MSC: 15A60 15B57 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Appl. Math. Lett. 21, No. 11, 1199--1203 (2008; Zbl 1158.15027) Full Text: DOI
Nakazato, Hiroshi; Bebiano, Natália; da Providência, João Product of diagonal entries of the unitary orbit of a 3-by-3 normal matrix. (English) Zbl 1143.15030 Linear Algebra Appl. 429, No. 4, 698-715 (2008). MSC: 15A60 15B57 15B51 47A12 PDFBibTeX XMLCite \textit{H. Nakazato} et al., Linear Algebra Appl. 429, No. 4, 698--715 (2008; Zbl 1143.15030) Full Text: DOI Link
Chien, Mao-Ting; Nakazato, Hiroshi The \(q\)-numerical range of unitarily irreducible 3-by-3 matrices. (English) Zbl 1147.15021 Int. J. Contemp. Math. Sci. 3, No. 5-8, 339-355 (2008). Reviewer: Mohammad Sal Moslehian (Mashhad) MSC: 15A60 11R29 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Int. J. Contemp. Math. Sci. 3, No. 5--8, 339--355 (2008; Zbl 1147.15021)
Nakazato, Hiroshi; Bebiano, Natália; da Providência, João The \(J\)-numerical range of a \(J\)-Hermitian matrix and related inequalities. (English) Zbl 1144.15020 Linear Algebra Appl. 428, No. 11-12, 2995-3014 (2008). Reviewer: Janko Bračič (Ljubljana) MSC: 15A60 46C20 47A12 15A45 PDFBibTeX XMLCite \textit{H. Nakazato} et al., Linear Algebra Appl. 428, No. 11--12, 2995--3014 (2008; Zbl 1144.15020) Full Text: DOI
Nakazato, Hiroshi; Bebiano, Natália; da Providência, João The numerical range of 2-dimensional Krein space operators. (English) Zbl 1141.15025 Can. Math. Bull. 51, No. 1, 86-99 (2008). Reviewer: Janko Bračič (Ljubljana) MSC: 15A60 47B50 47A12 15A63 PDFBibTeX XMLCite \textit{H. Nakazato} et al., Can. Math. Bull. 51, No. 1, 86--99 (2008; Zbl 1141.15025) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Flat portions on the boundary of the numerical ranges of certain Toeplitz matrices. (English) Zbl 1136.15019 Linear Multilinear Algebra 56, No. 1-2, 143-162 (2008). Reviewer: Janko Bračič (Ljubljana) MSC: 15A60 15B57 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Multilinear Algebra 56, No. 1--2, 143--162 (2008; Zbl 1136.15019) Full Text: DOI
Sai, Rintaro; Nakazato, Hiroshi Remark on a theorem of Taussky-Todd. (English) Zbl 1185.15019 Bull. Grad. Sch. Sci. Technol., Hirosaki Univ. 1, 1-4 (2007). MSC: 15A42 PDFBibTeX XMLCite \textit{R. Sai} and \textit{H. Nakazato}, Bull. Grad. Sch. Sci. Technol., Hirosaki Univ. 1, 1--4 (2007; Zbl 1185.15019)
Nakazato, Hiroshi; Bebiano, Natalia; da Providência, João Shapes of numerical ranges of operators on a 3-dimensional Krein space. (English) Zbl 1131.46021 Int. J. Algebra 1, No. 1-4, 185-204 (2007). MSC: 46C20 47A12 15A60 PDFBibTeX XMLCite \textit{H. Nakazato} et al., Int. J. Algebra 1, No. 1--4, 185--204 (2007; Zbl 1131.46021) Full Text: DOI Link
Chien, Mao-Ting; Nakazato, Hiroshi The boundary of the \(q\)-numerical range of a reducible matrix. (English) Zbl 1128.15014 Linear Multilinear Algebra 55, No. 3, 275-292 (2007). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 65F30 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Multilinear Algebra 55, No. 3, 275--292 (2007; Zbl 1128.15014) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi The \(q\)-numerical radius of weighted shift operators with periodic weights. (English) Zbl 1117.15027 Linear Algebra Appl. 422, No. 1, 198-218 (2007). Reviewer: Pei Yuan Wu (Hsinchu) MSC: 15A60 47A12 47B37 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 422, No. 1, 198--218 (2007; Zbl 1117.15027) Full Text: DOI
Nakazato, Hiroshi \(k\)-numerical range and the Minkowski sum. (English) Zbl 1168.47005 Bull. Fac. Sci. Technol., Hirosaki Univ. 9, No. 1, 1-7 (2006). Reviewer: Pei Yuan Wu (Hsinchu) MSC: 47A12 15A60 PDFBibTeX XMLCite \textit{H. Nakazato}, Bull. Fac. Sci. Technol., Hirosaki Univ. 9, No. 1, 1--7 (2006; Zbl 1168.47005)
Nakazato, Hiroshi The \(C\)-numerical range of a \(3\times 3\) normal matrix. (English) Zbl 1131.15029 Nihonkai Math. J. 17, No. 2, 187-197 (2006). MSC: 15A60 15B57 PDFBibTeX XMLCite \textit{H. Nakazato}, Nihonkai Math. J. 17, No. 2, 187--197 (2006; Zbl 1131.15029)
Nakazato, Hiroshi Numerical range of the matrix associated with some graph. (English) Zbl 1127.15020 Bull. Fac. Sci. Technol., Hirosaki Univ. 8, No. 2, 1-6 (2006). Reviewer: Mohammad Sal Moslehian (Mashhad) MSC: 15A60 05C50 05C20 PDFBibTeX XMLCite \textit{H. Nakazato}, Bull. Fac. Sci. Technol., Hirosaki Univ. 8, No. 2, 1--6 (2006; Zbl 1127.15020)
Chien, Mao-Ting; Nakazato, Hiroshi The \(q\)-numerical range of a reducible matrix via a normal operator. (English) Zbl 1110.15024 Linear Algebra Appl. 419, No. 2-3, 440-465 (2006). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 47A12 47B15 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 419, No. 2--3, 440--465 (2006; Zbl 1110.15024) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Elliptic curves arising from numerical ranges. (English) Zbl 1113.15018 Int. J. Pure Appl. Math. 30, No. 4, 441-465 (2006). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 14H52 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Int. J. Pure Appl. Math. 30, No. 4, 441--465 (2006; Zbl 1113.15018)
Chien, Mao-Ting; Nakazato, Hiroshi; Psarrakos, Panayiotis The \(q\)-numerical range and the Davis-Wielandt shell of reducible \(3 \times 3\) matrices. (English) Zbl 1095.15024 Linear Multilinear Algebra 54, No. 2, 79-112 (2006). Reviewer: Pei Yuan Wu (Hsinchu) MSC: 15A60 PDFBibTeX XMLCite \textit{M.-T. Chien} et al., Linear Multilinear Algebra 54, No. 2, 79--112 (2006; Zbl 1095.15024) Full Text: DOI
Nakazato, Hiroshi; Bebiano, Natália; Da Providência, João \(J\)-orthostochastic matrices of size \(3 \times 3\) and numerical ranges of Krein space operators. (English) Zbl 1081.15014 Linear Algebra Appl. 407, 211-232 (2005). Reviewer: Huang Wenxue (Scarborough) MSC: 15B51 46C20 15A60 47A12 PDFBibTeX XMLCite \textit{H. Nakazato} et al., Linear Algebra Appl. 407, 211--232 (2005; Zbl 1081.15014) Full Text: DOI
Bebiano, N.; Nakazato, H.; Da Providência, J.; Lemos, R.; Soares, G. Inequalities for \(J\)-Hermitian matrices. (English) Zbl 1091.15024 Linear Algebra Appl. 407, 125-139 (2005). Reviewer: Pei Yuan Wu (Hsinchu) MSC: 15A42 46C20 47A12 15A60 PDFBibTeX XMLCite \textit{N. Bebiano} et al., Linear Algebra Appl. 407, 125--139 (2005; Zbl 1091.15024) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi; Psarrakos, Panayiotis On the \(q\)-numerical range of matrices and matrix polynomials. (English) Zbl 1078.15021 Linear Multilinear Algebra 53, No. 5, 357-374 (2005). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 15A22 15A54 PDFBibTeX XMLCite \textit{M.-T. Chien} et al., Linear Multilinear Algebra 53, No. 5, 357--374 (2005; Zbl 1078.15021) Full Text: DOI
Nakazato, Hiroshi; Tsumura, Kozo \(k\)-numerical range and the structural performance of buildings. (English) Zbl 1075.15029 Sci. Math. Jpn. 61, No. 2, 225-241 (2005). Reviewer: Pei Yuan Wu (Hsinchu) MSC: 15A60 47A12 PDFBibTeX XMLCite \textit{H. Nakazato} and \textit{K. Tsumura}, Sci. Math. Jpn. 61, No. 2, 225--241 (2005; Zbl 1075.15029)
Nakazato, Hiroshi Conjugate figures of the Poncelet pair in numerical range. (English) Zbl 1073.15023 Bull. Fac. Sci. Technol., Hirosaki Univ. 7, No. 1, 9-14 (2004). Reviewer: Aurelian Gheondea (Bucureşti) MSC: 15A60 65F30 PDFBibTeX XMLCite \textit{H. Nakazato}, Bull. Fac. Sci. Technol., Hirosaki Univ. 7, No. 1, 9--14 (2004; Zbl 1073.15023)
Chien, Mao-Ting; Nakazato, Hiroshi Complex formulation of Poncelet property in numerical range. (English) Zbl 1057.15028 Linear Multilinear Algebra 52, No. 3-4, 159-175 (2004). Reviewer: Jaroslav Zemánek (Warszawa) MSC: 15A60 51N15 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Multilinear Algebra 52, No. 3--4, 159--175 (2004; Zbl 1057.15028) Full Text: DOI
Nakazato, Hiroshi Numerical range of a matrix polynomial. (English) Zbl 1260.15038 Takahashi, Wataru (ed.) et al., Proceedings of the 2nd international conference on nonlinear analysis and convex analysis (NACA2001), Hirosaki, Japan, July 30–August 2, 2001. Yokohama: Yokohama Publishers (ISBN 4-946552-09-X/hbk). 315-319 (2003). MSC: 15A60 15A22 47A12 15A54 PDFBibTeX XMLCite \textit{H. Nakazato}, in: Proceedings of the 2nd international conference on nonlinear analysis and convex analysis (NACA2001), Hirosaki, Japan, July 30--August 2, 2001. Yokohama: Yokohama Publishers. 315--319 (2003; Zbl 1260.15038)
Nakazato, Hiroshi Numerical range of certain weighted bilateral shift matrices. (English) Zbl 1041.15024 Bull. Fac. Sci. Technol., Hirosaki Univ. 6, No. 1, 1-18 (2003). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 PDFBibTeX XMLCite \textit{H. Nakazato}, Bull. Fac. Sci. Technol., Hirosaki Univ. 6, No. 1, 1--18 (2003; Zbl 1041.15024)
Ito, Masatoshi; Nakazato, Hiroshi; Okubo, Kazuyoshi; Yamazaki, Takeaki On generalized numerical range of the Aluthge transformation. (English) Zbl 1033.15022 Linear Algebra Appl. 370, 147-161 (2003). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 47A12 47A63 PDFBibTeX XMLCite \textit{M. Ito} et al., Linear Algebra Appl. 370, 147--161 (2003; Zbl 1033.15022) Full Text: DOI
Nakazato, Hiroshi Simultaneous numerical range and a rational surface. (English) Zbl 1041.15023 Bull. Fac. Sci. Technol., Hirosaki Univ. 5, No. 1, 1-10 (2002). Reviewer: Martín Argerami (Regina) MSC: 15A60 65F30 PDFBibTeX XMLCite \textit{H. Nakazato}, Bull. Fac. Sci. Technol., Hirosaki Univ. 5, No. 1, 1--10 (2002; Zbl 1041.15023)
Chien, Mao-Ting; Nakazato, Hiroshi; Psarrakos, Panayiotis Point equation of the boundary of the numerical range of a matrix polynomial. (English) Zbl 1006.15031 Linear Algebra Appl. 347, No. 1-3, 205-217 (2002). Reviewer: Rabe von Randow (Bonn) MSC: 15A60 15A22 PDFBibTeX XMLCite \textit{M.-T. Chien} et al., Linear Algebra Appl. 347, No. 1--3, 205--217 (2002; Zbl 1006.15031) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi The numerical range of linear pencils of 2-by-2 matrices. (English) Zbl 0996.15022 Linear Algebra Appl. 341, No. 1-3, 69-100 (2002). Reviewer: Mihail Voicu (Iaşi) MSC: 15A60 15A22 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 341, No. 1--3, 69--100 (2002; Zbl 0996.15022) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi Davis-Wielandt shell and \(q\)-numerical range. (English) Zbl 0994.15030 Linear Algebra Appl. 340, No. 1-3, 15-31 (2002). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 65F30 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 340, No. 1--3, 15--31 (2002; Zbl 0994.15030) Full Text: DOI
Nakazato, Hiroshi; Yamamoto, Junji Parametrization of an elliptic curve and the Jacobi elliptic functions. (English) Zbl 1005.15017 Bull. Fac. Sci. Technol., Hirosaki Univ. 4, No. 1, 1-6 (2001). Reviewer: Pei Yuan Wu (Hsinchu) MSC: 15A60 33E05 14H52 PDFBibTeX XMLCite \textit{H. Nakazato} and \textit{J. Yamamoto}, Bull. Fac. Sci. Technol., Hirosaki Univ. 4, No. 1, 1--6 (2001; Zbl 1005.15017)
Nakazato, Hiroshi Numerical range of a matrix polynomial. (Japanese) Zbl 0985.15503 RIMS Kokyuroku 1189, 23-30 (2001). MSC: 15A60 47A12 PDFBibTeX XMLCite \textit{H. Nakazato}, RIMS Kokyuroku 1189, 23--30 (2001; Zbl 0985.15503)
Nakazato, Hiroshi; Psarrakos, Panayiotis On the shape of numerical range of matrix polynomials. (English) Zbl 0996.15018 Linear Algebra Appl. 338, No. 1-3, 105-123 (2001). Reviewer: Pei Yuan Wu (Hsinchu) MSC: 15A60 15A54 47A12 PDFBibTeX XMLCite \textit{H. Nakazato} and \textit{P. Psarrakos}, Linear Algebra Appl. 338, No. 1--3, 105--123 (2001; Zbl 0996.15018) Full Text: DOI
Chien, Mao-Ting; Nakazato, Hiroshi The \(c\)-numerical range of tridiagonal matrices. (English) Zbl 0982.15034 Linear Algebra Appl. 335, No. 1-3, 55-61 (2001). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 15B57 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 335, No. 1--3, 55--61 (2001; Zbl 0982.15034) Full Text: DOI
Nakazato, Hiroshi Some properties of the boundary of the \(C\)-numerical range of a matrix. (English) Zbl 0965.15029 Bull. Fac. Sci. Technol., Hirosaki Univ. 3, No. 1, 1-10 (2000). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 PDFBibTeX XMLCite \textit{H. Nakazato}, Bull. Fac. Sci. Technol., Hirosaki Univ. 3, No. 1, 1--10 (2000; Zbl 0965.15029)
Nakazato, Hiroshi Quintic elliptic curves arising in numerical range. (English) Zbl 0964.15029 Bull. Fac. Sci. Technol., Hirosaki Univ. 2, No. 2, 107-122 (2000). Reviewer: Grosio Stanilov (Sofia) MSC: 15A60 14H52 11G05 PDFBibTeX XMLCite \textit{H. Nakazato}, Bull. Fac. Sci. Technol., Hirosaki Univ. 2, No. 2, 107--122 (2000; Zbl 0964.15029)
Nakazato, Hiroshi A generalization of a theorem of Gårding. (English) Zbl 0997.12002 Bull. Fac. Sci. Technol., Hirosaki Univ. 2, No. 1, 1-6 (1999). Reviewer: S.Norvidas (Vilnius) MSC: 12E10 35L25 15A60 PDFBibTeX XMLCite \textit{H. Nakazato}, Bull. Fac. Sci. Technol., Hirosaki Univ. 2, No. 1, 1--6 (1999; Zbl 0997.12002)
Chien, Mao-Ting; Nakazato, Hiroshi Boundary generating curves of the \(c\)-numerical range. (English) Zbl 0932.15017 Linear Algebra Appl. 294, No. 1-3, 67-84 (1999). Reviewer: Alexey Alimov (Moskva) MSC: 15A60 15B57 14G05 PDFBibTeX XMLCite \textit{M.-T. Chien} and \textit{H. Nakazato}, Linear Algebra Appl. 294, No. 1--3, 67--84 (1999; Zbl 0932.15017) Full Text: DOI
Nakazato, Hiroshi Hyperbolic cubic ternary forms. (English) Zbl 0924.15023 Bull. Fac. Sci. Technol., Hirosaki Univ. 1, No. 1, 9-18 (1998). Reviewer: Philippe Elbaz-Vincent (Montpellier) MSC: 15A60 15B57 11E76 PDFBibTeX XMLCite \textit{H. Nakazato}, Bull. Fac. Sci. Technol., Hirosaki Univ. 1, No. 1, 9--18 (1998; Zbl 0924.15023)
Li, Chi-Kwong; Nakazato, Hiroshi Some results on the \(q\)-numerical range. (English) Zbl 0899.15017 Linear Multilinear Algebra 43, No. 4, 385-409 (1998). Reviewer: Y.Kuo (Knoxville) MSC: 15A60 65F30 PDFBibTeX XMLCite \textit{C.-K. Li} and \textit{H. Nakazato}, Linear Multilinear Algebra 43, No. 4, 385--409 (1998; Zbl 0899.15017) Full Text: DOI
Nakazato, Hiroshi A proof of the duality theorem between the \(q\)-numerical ranges and the higher dimensional numerical ranges. (English) Zbl 0899.15018 Sci. Rep. Hirosaki Univ. 44, No. 2, 183-187 (1997). Reviewer: K.H.Kim (Montgomery) MSC: 15A60 PDFBibTeX XMLCite \textit{H. Nakazato}, Sci. Rep. Hirosaki Univ. 44, No. 2, 183--187 (1997; Zbl 0899.15018)
Nakazato, Hiroshi; Takaguchi, Makoto Rational plane curves associated to certain nilpotent matrices. (English) Zbl 0885.15018 Sci. Rep. Hirosaki Univ. 44, No. 1, 1-18 (1997). Reviewer: R.von Randow (Bonn) MSC: 15A60 14H45 PDFBibTeX XMLCite \textit{H. Nakazato} and \textit{M. Takaguchi}, Sci. Rep. Hirosaki Univ. 44, No. 1, 1--18 (1997; Zbl 0885.15018)
Nakazato, Hiroshi; Wakaizumi, Kanako An alternating condition for certain generalized numerical ranges to be convex. (English) Zbl 0864.15019 Sci. Rep. Hirosaki Univ. 43, No. 1, 1-7 (1996). Reviewer: S.Sridhar (Sharjah) MSC: 15A60 PDFBibTeX XMLCite \textit{H. Nakazato} and \textit{K. Wakaizumi}, Sci. Rep. Hirosaki Univ. 43, No. 1, 1--7 (1996; Zbl 0864.15019)