Ôta, Schôichi; Szafraniec, Franciszek Hugon Q-positive definiteness and related operators. (English) Zbl 1153.47302 J. Math. Anal. Appl. 329, No. 2, 987-997 (2007). MSC: 47B20 47B32 47B25 PDFBibTeX XMLCite \textit{S. Ôta} and \textit{F. H. Szafraniec}, J. Math. Anal. Appl. 329, No. 2, 987--997 (2007; Zbl 1153.47302) Full Text: DOI
Ôta, Schôichi \(q\)-deformed circular operators. (English) Zbl 1105.47020 Integral Equations Oper. Theory 54, No. 4, 555-569 (2006). Reviewer: Anatoly N. Kochubei (Kyïv) MSC: 47B20 47B37 46L65 47N50 PDFBibTeX XMLCite \textit{S. Ôta}, Integral Equations Oper. Theory 54, No. 4, 555--569 (2006; Zbl 1105.47020) Full Text: DOI
Ôta, Schôichi On \(q\)-deformed hyponormal operators. (English) Zbl 1036.47013 Math. Nachr. 248-249, 144-150 (2003). Reviewer: Bernd Kuckert (Hamburg) MSC: 47B20 47A05 47A10 47B25 PDFBibTeX XMLCite \textit{S. Ôta}, Math. Nachr. 248--249, 144--150 (2003; Zbl 1036.47013) Full Text: DOI
Ôta, Schôichi On \(q\)-modified hyponormal operators. (Japanese) Zbl 0985.47507 RIMS Kokyuroku 1189, 134-137 (2001). MSC: 47B20 PDFBibTeX XMLCite \textit{S. Ôta}, RIMS Kokyuroku 1189, 134--137 (2001; Zbl 0985.47507)
Ôta, Schôichi On normal extensions of unbounded operators. (English) Zbl 0922.47019 Bull. Pol. Acad. Sci., Math. 46, No. 3, 291-301 (1998). MSC: 47B20 PDFBibTeX XMLCite \textit{S. Ôta}, Bull. Pol. Acad. Sci., Math. 46, No. 3, 291--301 (1998; Zbl 0922.47019)
Ôta, Schôichi Normal extensions of unbounded operators. (Japanese) Zbl 0925.47013 RIMS Kokyuroku 979, 120-123 (1997). MSC: 47B20 47A20 47B15 PDFBibTeX XMLCite \textit{S. Ôta}, RIMS Kokyuroku 979, 120--123 (1997; Zbl 0925.47013)
Ôta, Schôichi A quasi-affine transform of an unbounded operator. (English) Zbl 0820.47026 Stud. Math. 112, No. 3, 279-284 (1995). MSC: 47B20 PDFBibTeX XMLCite \textit{S. Ôta}, Stud. Math. 112, No. 3, 279--284 (1995; Zbl 0820.47026) Full Text: DOI EuDML
Ōta, Schōichi Unbounded subnormal operators. (Japanese) Zbl 0900.47020 Fujii, Masatoshi (ed.), Operator inequalities and related topics. Proceedings of a symposium held at the Research Institute for Mathematical Sciences, Kyoto University, Kyoto, Japan, November 28–30, 1994. Kyoto: Kyoto Univ., Research Institute for Mathematical Sciences, RIMS Kôkyûroku. 903, 138-141 (1995). MSC: 47B20 PDFBibTeX XMLCite \textit{S. Ōta}, in: Operator inequalities and related topics. Proceedings of a symposium held at the Research Institute for Mathematical Sciences, Kyoto University, Kyoto, Japan, November 28--30, 1994. Kyoto: Kyoto Univ., Research Institute for Mathematical Sciences. 138--141 (1995; Zbl 0900.47020)