Jung, Il Bong; Li, Chunji Backward extensions of hyponormal weighted shifts. (English) Zbl 0974.47024 Math. Jap. 52, No. 2, 267-278 (2000). MSC: 47B37 47B20 PDFBibTeX XMLCite \textit{I. B. Jung} and \textit{C. Li}, Math. Japon. 52, No. 2, 267--278 (2000; Zbl 0974.47024)
Fujii, Masatoshi; Jung, Dongick; Lee, Sang Hun; Lee, Mi Young; Nakamoto, Ritsuo Some classes of operators related to paranormal and log-hyponormal operators. (English) Zbl 0963.47018 Math. Jap. 51, No. 3, 395-402 (2000). Reviewer: Harkrishan L.Vasudeva (Chandigarh) MSC: 47B20 47A63 PDFBibTeX XMLCite \textit{M. Fujii} et al., Math. Japon. 51, No. 3, 395--402 (2000; Zbl 0963.47018)
Yanagida, Masahiro Research on order preserving operator inequalities. (English) Zbl 0971.47015 Math. Jap. 51, No. 1, 125-135 (2000). Reviewer: Vladimir V.Peller (Manhattan) MSC: 47A63 47B20 PDFBibTeX XMLCite \textit{M. Yanagida}, Math. Japon. 51, No. 1, 125--135 (2000; Zbl 0971.47015)
Putinar, Mihai On Weyl spectrum in several variables. (English) Zbl 0952.47008 Math. Jap. 50, No. 3, 355-357 (1999). Reviewer: P.C.Sinha (Patna) MSC: 47A13 47A10 47B20 47A60 PDFBibTeX XMLCite \textit{M. Putinar}, Math. Japon. 50, No. 3, 355--357 (1999; Zbl 0952.47008)
Lee, Sang Hoon; Lee, Woo Young On Weyl’s theorem. II. (English) Zbl 0856.47006 Math. Jap. 43, No. 3, 549-553 (1996). MSC: 47A10 47B20 47A53 47A35 PDFBibTeX XMLCite \textit{S. H. Lee} and \textit{W. Y. Lee}, Math. Japon. 43, No. 3, 549--553 (1996; Zbl 0856.47006)
Fujii, Masatoshi; Nakamoto, Ritsuo; Seo, Yuki Graphs and Gersgorin’s theorem. (English) Zbl 0855.47001 Math. Jap. 43, No. 3, 517-523 (1996). MSC: 47A10 46L37 05C20 47B20 PDFBibTeX XMLCite \textit{M. Fujii} et al., Math. Japon. 43, No. 3, 517--523 (1996; Zbl 0855.47001)
Fujii, Masatoshi; Nakamoto, Ritsuo; Watanabe, Hideharu The Heinz-Kato-Furuta inequality and hyponormal operators. (English) Zbl 0817.47022 Math. Jap. 40, No. 3, 469-472 (1994). MSC: 47A63 47B20 47A30 PDFBibTeX XMLCite \textit{M. Fujii} et al., Math. Japon. 40, No. 3, 469--472 (1994; Zbl 0817.47022)
Fujii, Masatoshi; Himeji, Chikako; Matsumoto, Akemi Theorems of Ando and Saito for \(p\)-hyponormal operators. (English) Zbl 0815.47025 Math. Jap. 39, No. 3, 595-598 (1994). MSC: 47B20 47A63 47A30 PDFBibTeX XMLCite \textit{M. Fujii} et al., Math. Japon. 39, No. 3, 595--598 (1994; Zbl 0815.47025)
Izumino, Saichi Uchiyama’s commutativity theorem on positive operators. II. (English) Zbl 0816.47019 Math. Jap. 39, No. 2, 381-383 (1994). Reviewer: S.Richter (Knoxville) MSC: 47B15 47A10 47B20 47A30 PDFBibTeX XMLCite \textit{S. Izumino}, Math. Japon. 39, No. 2, 381--383 (1994; Zbl 0816.47019)
Fujii, Masatoshi; Nakamoto, Ritsuo An enlarging of spectra for Hilbert space operators. (English) Zbl 0798.47003 Math. Jap. 38, No. 6, 1081-1083 (1993). MSC: 47A10 47B20 47A30 PDFBibTeX XMLCite \textit{M. Fujii} and \textit{R. Nakamoto}, Math. Japon. 38, No. 6, 1081--1083 (1993; Zbl 0798.47003)
Fujii, Jun Ichi; Seo, Yuki Graphs and numerical center of mass. (English) Zbl 0781.47012 Math. Jap. 38, No. 2, 351-359 (1993). Reviewer: T.Yoshino (Kawauchi) MSC: 47A12 05C20 05C75 47B20 PDFBibTeX XMLCite \textit{J. I. Fujii} and \textit{Y. Seo}, Math. Japon. 38, No. 2, 351--359 (1993; Zbl 0781.47012)
Fujii, Jun Ichi; Seo, Yuki Graphs and the Radjavi-Williams factorization. (English) Zbl 0731.47023 Math. Jap. 35, No. 6, 1189-1195 (1990). Reviewer: M.Gonzalez (Santander) MSC: 47B20 05C20 47B06 05C75 PDFBibTeX XMLCite \textit{J. I. Fujii} and \textit{Y. Seo}, Math. Japon. 35, No. 6, 1189--1195 (1990; Zbl 0731.47023)
Fujii, Masatoshi; Sasaoka, Hiromitsu; Watatani, Yasuo The numerical radius of an infinite directed graph. (English) Zbl 0715.05031 Math. Jap. 35, No. 3, 577-582 (1990). Reviewer: A.Torgašev MSC: 05C20 47A12 47B20 PDFBibTeX XMLCite \textit{M. Fujii} et al., Math. Japon. 35, No. 3, 577--582 (1990; Zbl 0715.05031)
Fujii, Jun Ichi; Seo, Yuki Graphs and Stampfli’s center of mass. (English) Zbl 0707.05034 Math. Jap. 35, No. 5, 855-860 (1990). MSC: 05C20 47B20 47B07 05C75 PDFBibTeX XMLCite \textit{J. I. Fujii} and \textit{Y. Seo}, Math. Japon. 35, No. 5, 855--860 (1990; Zbl 0707.05034)
Fujii, Masatoshi; Sasaoka, Hiromitsu; Watatani, Yasuo Adjacency operators of infinite directed graphs. (English) Zbl 0715.05032 Math. Jap. 34, No. 5, 727-735 (1989). Reviewer: A.Torgašev MSC: 05C20 05C75 47B20 PDFBibTeX XMLCite \textit{M. Fujii} et al., Math. Japon. 34, No. 5, 727--735 (1989; Zbl 0715.05032)
Tanahashi, Kôtarô; Yoshino, Takashi Weak decomposable and spectral operators on a weakly complete Banach space. (English) Zbl 0693.47030 Math. Jap. 34, No. 5, 831-835 (1989). Reviewer: M.Radjabalipour MSC: 47B40 47B20 47A15 PDFBibTeX XMLCite \textit{K. Tanahashi} and \textit{T. Yoshino}, Math. Japon. 34, No. 5, 831--835 (1989; Zbl 0693.47030)
Kittaneh, Fuad; Szeptycki, Pawel On operators with positive real parts. (English) Zbl 0693.47018 Math. Jap. 34, No. 6, 933-939 (1989). Reviewer: M.Radjabalipour MSC: 47B15 47B20 47B44 PDFBibTeX XMLCite \textit{F. Kittaneh} and \textit{P. Szeptycki}, Math. Japon. 34, No. 6, 933--939 (1989; Zbl 0693.47018)
Yoshino, Takashi On disjoint ordered pairs of operators. (English) Zbl 0632.47020 Math. Jap. 32, 681-686 (1987). Reviewer: G.Garske MSC: 47B20 47B35 47A10 47B47 PDFBibTeX XMLCite \textit{T. Yoshino}, Math. Japon. 32, 681--686 (1987; Zbl 0632.47020)
Choda, Hisashi; Fujii, Masatoshi; Nakamura, Masahiro The Krylov-Weinstein theorem for non-normal operators. (English) Zbl 0561.47003 Math. Jap. 30, 107-108 (1985). MSC: 47A10 47B20 PDFBibTeX XMLCite \textit{H. Choda} et al., Math. Japon. 30, 107--108 (1985; Zbl 0561.47003)
Fujii, M.; Hasegawa, S.; Yokoi, S. A simple example off the Fuglede-Putnam theorem. (English) Zbl 0554.47010 Math. Jap. 29, 795-796 (1984). MSC: 47B20 47B10 47B37 PDFBibTeX XMLCite \textit{M. Fujii} et al., Math. Japon. 29, 795--796 (1984; Zbl 0554.47010)
Kainuma, Daisuke; Matsumoto, Akemi; Seo, Yuki Inequalities for spectra of operators. (English) Zbl 0549.47001 Math. Jap. 27, 635-636 (1982). Reviewer: W.Arendt MSC: 47A10 47A12 47B20 47B15 PDFBibTeX XMLCite \textit{D. Kainuma} et al., Math. Japon. 27, 635--636 (1982; Zbl 0549.47001)
Kobayashi, Akihiro; Okayasu, Takateru A remark on a theorem of Goya and Saito. (English) Zbl 0503.47021 Math. Jap. 27, 549-550 (1982). MSC: 47B20 46L05 47A15 PDFBibTeX XMLCite \textit{A. Kobayashi} and \textit{T. Okayasu}, Math. Japon. 27, 549--550 (1982; Zbl 0503.47021)
Matsumoto, Akemi; Seo, Yûki An inclusion theorem for non-normal operators. II. (English) Zbl 0486.47004 Math. Japon. 27, 75-76 (1982). Reviewer: Akemi Matsumoto MSC: 47A10 47A12 47B20 PDFBibTeX XMLCite \textit{A. Matsumoto} and \textit{Y. Seo}, Math. Japon. 27, 75--76 (1982; Zbl 0486.47004)
Furuta, Takayuki; Izumino, Saichi; Prasanna, Shanti A characterization of centroid operators. (English) Zbl 0485.47013 Math. Jap. 27, 105-106 (1982). MSC: 47B20 47A10 47A12 PDFBibTeX XMLCite \textit{T. Furuta} et al., Math. Japon. 27, 105--106 (1982; Zbl 0485.47013)
Fujii, Masatoshi; Prasanna, Shanti Translatable radii for operators. (English) Zbl 0487.47007 Math. Jap. 26, 653-657 (1981). MSC: 47A30 47A10 47A12 47B20 47B15 PDFBibTeX XMLCite \textit{M. Fujii} and \textit{S. Prasanna}, Math. Japon. 26, 653--657 (1981; Zbl 0487.47007)
Pandya, Madhavi; Sheth, I. H. Boundary spectra of certain operators on Hilbert space. (English) Zbl 0473.47003 Math. Jap. 26, 419-420 (1981). MSC: 47A12 47A10 47B20 PDFBibTeX XMLCite \textit{M. Pandya} and \textit{I. H. Sheth}, Math. Japon. 26, 419--420 (1981; Zbl 0473.47003)
Acharya, J. D.; Sheth, I. H. A note on essentially invariant classes of operators. (English) Zbl 0455.47019 Math. Jap. 25, 421-422 (1980). MSC: 47B20 47A20 47A10 PDFBibTeX XMLCite \textit{J. D. Acharya} and \textit{I. H. Sheth}, Math. Japon. 25, 421--422 (1980; Zbl 0455.47019)
Izumino, Saichi Inequalities on operators with closed range. (English) Zbl 0454.47001 Math. Jap. 25, 423-429 (1980). MSC: 47A05 47A10 47A30 47B20 PDFBibTeX XMLCite \textit{S. Izumino}, Math. Japon. 25, 423--429 (1980; Zbl 0454.47001)
Fujii, Masatoshi; Nakamoto, Ritsuo Intertwining algebraically definite operators. (English) Zbl 0442.47015 Math. Jap. 25, 239-240 (1980). MSC: 47B20 47B15 PDFBibTeX XMLCite \textit{M. Fujii} and \textit{R. Nakamoto}, Math. Japon. 25, 239--240 (1980; Zbl 0442.47015)
Acharya, J. D. On operators associated with operator radii and generalized numerical ranges. (English) Zbl 0442.47002 Math. Jap. 25, 333-336 (1980). MSC: 47A12 47A10 47B20 PDFBibTeX XMLCite \textit{J. D. Acharya}, Math. Japon. 25, 333--336 (1980; Zbl 0442.47002)
Izumino, Saichi Inequalities on \(G_1\)-operators. (English) Zbl 0435.47005 Math. Jap. 24, 521-526 (1980). MSC: 47A10 47B20 PDFBibTeX XMLCite \textit{S. Izumino}, Math. Japon. 24, 521--526 (1980; Zbl 0435.47005)
Dash, A. T. Compact restrictions of several operators. (English) Zbl 0433.47003 Math. Jap. 24, 363-366 (1979). MSC: 47A10 47A15 47B06 47B20 PDFBibTeX XMLCite \textit{A. T. Dash}, Math. Japon. 24, 363--366 (1979; Zbl 0433.47003)
Campbell, S. L.; Gupta, B. C. On k-quasihyponormal operators. (English) Zbl 0398.47014 Math. Jap. 23, 185-189 (1978). MSC: 47B20 47A10 47A15 PDFBibTeX XMLCite \textit{S. L. Campbell} and \textit{B. C. Gupta}, Math. Japon. 23, 185--189 (1978; Zbl 0398.47014)
Kato, Yoshinobu On operators considered by Campbell. II. (English) Zbl 0388.47013 Math. Jap. 23, 123-126 (1978). MSC: 47B20 47A55 PDFBibTeX XMLCite \textit{Y. Kato}, Math. Japon. 23, 123--126 (1978; Zbl 0388.47013)
Phadke, S. V.; Thakare, N. K. On the generalized numerical ranges of operators. (English) Zbl 0378.47001 Math. Jap. 23, 139-140 (1978). MSC: 47A10 47A20 47B20 PDFBibTeX XMLCite \textit{S. V. Phadke} and \textit{N. K. Thakare}, Math. Japon. 23, 139--140 (1978; Zbl 0378.47001)
Dash, A. T. As an operator grows, does the boundary of its spectrum grow? (English) Zbl 0381.47002 Math. Jap. 22, 361-363 (1977). MSC: 47A10 47A15 47A20 47B20 PDFBibTeX XMLCite \textit{A. T. Dash}, Math. Japon. 22, 361--363 (1977; Zbl 0381.47002)
Kato, Yoshinobu; Moriya, Nobuhiro On operators considered by Campbell. (English) Zbl 0366.47011 Math. Jap. 22, 233-238 (1977). MSC: 47B20 47B15 47A55 PDFBibTeX XMLCite \textit{Y. Kato} and \textit{N. Moriya}, Math. Japon. 22, 233--238 (1977; Zbl 0366.47011)
Furuta, Takayuki; Matsumoto, Kyoko; Moriya, Nobuhiro A simple condition on hyponormal operators implying subnormality. (English) Zbl 0356.47016 Math. Jap. 21, 399-400 (1976). MSC: 47B20 PDFBibTeX XMLCite \textit{T. Furuta} et al., Math. Japon. 21, 399--400 (1976; Zbl 0356.47016)
Kato, Yoshinobu; Nishitani, Izumi A remark on a paper of Kubo. (English) Zbl 0354.47014 Math. Jap. 21, 121-122 (1976). MSC: 47B20 PDFBibTeX XMLCite \textit{Y. Kato} and \textit{I. Nishitani}, Math. Japon. 21, 121--122 (1976; Zbl 0354.47014)
Malik, K. C.; Arora, A. K. Partial isometries with reducing null spaces. (English) Zbl 0348.47019 Math. Jap. 21, 375-376 (1976). MSC: 47B20 PDFBibTeX XMLCite \textit{K. C. Malik} and \textit{A. K. Arora}, Math. Japon. 21, 375--376 (1976; Zbl 0348.47019)
Fujii, Masatoshi; Kajiwara, Mitsuharu; Kato, Yoshinobu; Kubo, Fumio Decompositions of operators in Hilbert spaces. (English) Zbl 0343.47027 Math. Jap. 21, 117-120 (1976). MSC: 47B99 47B15 47B20 PDFBibTeX XMLCite \textit{M. Fujii} et al., Math. Japon. 21, 117--120 (1976; Zbl 0343.47027)
Fujii, Masatoshi Similarity and algebraical definiteness of operators. (English) Zbl 0343.47026 Math. Jap. 21, 37-41 (1976). MSC: 47B99 47A45 47B20 PDFBibTeX XMLCite \textit{M. Fujii}, Math. Japon. 21, 37--41 (1976; Zbl 0343.47026)
Kubo, Fumio On algebraically definite operators. (English) Zbl 0343.47025 Math. Jap. 21, 23-35 (1976). MSC: 47B99 47A45 47B20 47C15 PDFBibTeX XMLCite \textit{F. Kubo}, Math. Japon. 21, 23--35 (1976; Zbl 0343.47025)
Fujii, Masatoshi Some normality conditions for operators and Berberian subrepresentations. (English) Zbl 0343.47019 Math. Jap. 21, 259-263 (1976). MSC: 47B20 47A10 47B15 47B40 PDFBibTeX XMLCite \textit{M. Fujii}, Math. Japon. 21, 259--263 (1976; Zbl 0343.47019)
Fujii, Masatoshi; Kato, Yoshinobu On heminormal weighted shifts. (English) Zbl 0342.47019 Math. Jap. 21, 43-49 (1976). MSC: 47B20 46L05 PDFBibTeX XMLCite \textit{M. Fujii} and \textit{Y. Kato}, Math. Japon. 21, 43--49 (1976; Zbl 0342.47019)
Nishitani, Izumi; Watatani, Yasuo Some theorems on paranormal operators. (English) Zbl 0342.47018 Math. Jap. 21, 123-126 (1976). MSC: 47B20 PDFBibTeX XMLCite \textit{I. Nishitani} and \textit{Y. Watatani}, Math. Japon. 21, 123--126 (1976; Zbl 0342.47018)
Kim, Hong W. On the unilateral shift and the norm closure of the range of a derivation. (English) Zbl 0311.47001 Math. Jap. 19, 251-256 (1974). MSC: 47A10 47B20 47C05 PDFBibTeX XMLCite \textit{H. W. Kim}, Math. Japon. 19, 251--256 (1974; Zbl 0311.47001)
Shah, N. C.; Sheth, I. H. On paranormal operators. (English) Zbl 0295.47035 Math. Jap. 19, 79-81 (1974). MSC: 47B20 PDFBibTeX XMLCite \textit{N. C. Shah} and \textit{I. H. Sheth}, Math. Japon. 19, 79--81 (1974; Zbl 0295.47035)