Istrăţescu, Vasile Fixed points for some applications. (Romanian) Zbl 1439.47038 Gaz. Mat., Ser. Inf. Ştiinţ. Perfect. Metod. 15(94), No. 3, 141-151 (1997). MSC: 47H10 PDFBibTeX XMLCite \textit{V. Istrăţescu}, Gaz. Mat., Ser. Inf. Științ. Perfecț. Metod. 15(94), No. 3, 141--151 (1997; Zbl 1439.47038)
Istrăţescu, Vasile Ion On the Diophantine equation \(x^ 4-2y^ 4=1\). (English) Zbl 1101.11315 Skr., K. Nor. Vidensk. Selsk. 1989, No. 1, 15 (1989). MSC: 11D25 PDFBibTeX XMLCite \textit{V. I. Istrăţescu}, Skr., K. Nor. Vidensk. Selsk. 1989, No. 1, 15 (1989; Zbl 1101.11315)
Istrăţescu, Vasile Ion On the diophantine equation \(x^ 4-2y^ 4=1\). (English) Zbl 0693.10012 Skr., K. Nor. Vidensk. Selsk. 1989, No. 1, 15 (1989). Reviewer: B.Richter MSC: 11D25 PDFBibTeX XMLCite \textit{V. I. Istrăţescu}, Skr., K. Nor. Vidensk. Selsk. 1989, No. 1, 15 (1989; Zbl 0693.10012)
Istrăţescu, Vasile Ion Inner product structures. Theory and applications. (English) Zbl 0629.46027 Mathematics and its Applications, 25. Dordrecht etc.: D. Reidel Publishing Company, a member of the Kluwer Academic Publishers Group. XV, 895 p.; Dfl. 360.00; $ 149.00; £119.00 (1987). Reviewer: T.Ando MSC: 46Cxx 46-02 46S10 46E20 46C99 47L30 PDFBibTeX XML
Istratescu, Vasile I. An algebraic characterization of complete inner product spaces. (English) Zbl 0619.46018 Int. J. Math. Math. Sci. 9, 47-53 (1986). Reviewer: J.Wada MSC: 46C99 46E20 46B20 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Int. J. Math. Math. Sci. 9, 47--53 (1986; Zbl 0619.46018) Full Text: DOI EuDML
Istrǎţescu, Vasile I. A note on expanding maps. (English) Zbl 0596.47035 Appl. Anal. 18, 151-152 (1984). Reviewer: J.Appell MSC: 47H09 PDFBibTeX XMLCite \textit{V. I. Istrǎţescu}, Appl. Anal. 18, 151--152 (1984; Zbl 0596.47035) Full Text: DOI
Istrăţescu, Vasile I. On the convergence of Neumann series in Banach space. (English) Zbl 0595.47039 Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 76, 14-18 (1984). Reviewer: I.A.Rus MSC: 47H09 47H10 PDFBibTeX XMLCite \textit{V. I. Istrăţescu}, Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 76, 14--18 (1984; Zbl 0595.47039)
Istrăţescu, Vasile I.; Constantin, Gheorghe On quasi-analytic vectors for some classes of operators. (English) Zbl 0564.47001 Port. Math. 42(1983-1984), No. 1-2, 219-224 (1984). Reviewer: Vasile I. Istrăţescu MSC: 47A05 47B44 46H05 17B35 PDFBibTeX XMLCite \textit{V. I. Istrăţescu} and \textit{G. Constantin}, Port. Math. 42, No. 1--2, 219--224 (1984; Zbl 0564.47001) Full Text: EuDML
Istrăţescu, V. I.; Partington, J. R. On nearly uniformly convex and k-uniformly convex spaces. (English) Zbl 0553.46016 Math. Proc. Camb. Philos. Soc. 95, 325-327 (1984). Reviewer: I.Şerb MSC: 46B20 47H09 46B03 PDFBibTeX XMLCite \textit{V. I. Istrăţescu} and \textit{J. R. Partington}, Math. Proc. Camb. Philos. Soc. 95, 325--327 (1984; Zbl 0553.46016) Full Text: DOI
Istrăţescu, Vasile I. Strict convexity and complex strict convexity. Theory and applications. (English) Zbl 0538.46012 Lecture Notes in Pure and Applied Mathematics, Vol. 89. New York-Basel: Marcel Dekker, Inc. X, 312 p. (1984). Reviewer: M.Kadec MSC: 46B20 46-02 47L10 PDFBibTeX XML
Istrǎtescu, Vasile I. Generalizing normality for operators on Banach spaces: Hyponormality. I. (English) Zbl 0587.47032 Collect. Math. 34, 247-259 (1983). Reviewer: T.Yoshino MSC: 47B20 46H05 PDFBibTeX XMLCite \textit{V. I. Istrǎtescu}, Collect. Math. 34, 247--259 (1983; Zbl 0587.47032) Full Text: EuDML
Istrăţescu, Vasile I. Some fixed point theorems for convex contraction mappings and mappings with convex diminishing diameters. II. (English) Zbl 0579.54033 Ann. Mat. Pura Appl., IV. Ser. 134, 327-362 (1983). MSC: 54H25 47H10 PDFBibTeX XMLCite \textit{V. I. Istrăţescu}, Ann. Mat. Pura Appl. (4) 134, 327--362 (1983; Zbl 0579.54033) Full Text: DOI
Istratescu, Vasile I. Another proof that a complex Hilbert algebra is isomorphic to the complex numbers. (English) Zbl 0554.46024 Indian J. Pure Appl. Math. 14, 179-180 (1983). Reviewer: F.-H.Vasilescu MSC: 46K15 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Indian J. Pure Appl. Math. 14, 179--180 (1983; Zbl 0554.46024)
Istratescu, Vasile I. Some fixed point theorems for convex contraction mappings and mappings with convex diminishing diameters. I. (English) Zbl 0477.54033 Ann. Mat. Pura Appl., IV. Ser. 130, 89-104 (1982). MSC: 54H25 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Ann. Mat. Pura Appl. (4) 130, 89--104 (1982; Zbl 0477.54033) Full Text: DOI
Istratescu, Vasile I. Some fixed point theorems for convex contraction mappings and convex nonexpansive mappings. I. (English) Zbl 0477.54032 Libertas Math. 1, 151-163 (1981). MSC: 54H25 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Libertas Math. 1, 151--163 (1981; Zbl 0477.54032)
Istratescu, Vasile I. Fixed point theory. An introduction. (English) Zbl 0465.47035 Mathematics and Its Applications, Vol. 7. Dordrecht - Boston -London: D. Reidel Publishing Company. XV, 466 p. Dfl. 135.00; $ 71.00 (1981). MSC: 47H10 54H25 58C30 47-02 55M25 60H25 PDFBibTeX XML
Istratescu, Vasile I. Introduction to linear operator theory. (English) Zbl 0457.47001 Pure and Applied Mathematics, 65. New York, Basel: Marcel Dekker, Inc. XI, 579 p. SFr. 88.00 (1981). MSC: 47A05 47-02 47A12 47B20 46H05 47B25 47D03 47A35 PDFBibTeX XML
Fong, Che-Kao; Istratescu, Vasile I. Some characterizations of Hermitian operators and related classes of operators. I. (English) Zbl 0436.47015 Proc. Am. Math. Soc. 76, 107-112 (1979). MSC: 47B15 47B20 PDFBibTeX XMLCite \textit{C.-K. Fong} and \textit{V. I. Istratescu}, Proc. Am. Math. Soc. 76, 107--112 (1979; Zbl 0436.47015) Full Text: DOI
Istratescu, Vasile I. On complex strictly convex spaces. II. (English) Zbl 0431.46011 J. Math. Anal. Appl. 71, 580-589 (1979). MSC: 46A55 46B20 52A07 PDFBibTeX XMLCite \textit{V. I. Istratescu}, J. Math. Anal. Appl. 71, 580--589 (1979; Zbl 0431.46011) Full Text: DOI
Istratescu, Vasile; Istratescu, Ioana On complex strictly convex spaces. I. (English) Zbl 0423.46009 J. Math. Anal. Appl. 70, 423-429 (1979). MSC: 46B20 46A55 52A07 PDFBibTeX XMLCite \textit{V. Istratescu} and \textit{I. Istratescu}, J. Math. Anal. Appl. 70, 423--429 (1979; Zbl 0423.46009) Full Text: DOI
Istratescu, Vasile I. On complex strictly convex spaces. III. (English) Zbl 0431.46012 Rend. Ist. Mat. Univ. Trieste 10, 48-56 (1978). MSC: 46A55 46B20 52A07 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Rend. Ist. Mat. Univ. Trieste 10, 48--56 (1978; Zbl 0431.46012)
Onicescu, Octav; Istratescu, Vasile I. Approximation theorems for random functions. II. (English) Zbl 0401.60057 Rend. Mat., VI. Ser. 11, 585-589 (1978). MSC: 60G99 60A10 PDFBibTeX XMLCite \textit{O. Onicescu} and \textit{V. I. Istratescu}, Rend. Mat., VI. Ser. 11, 585--589 (1978; Zbl 0401.60057)
Istratescu, Vasile I. On the spectral mixing theorem for some classes of Banach spaces and for the numerical contractions on Hilbert spaces. (English) Zbl 0388.28022 Probab. Theory on Vector Spaces, Proc. Conf. Trzebieszowice 1977, Lect. Notes Math. 656, 67-75 (1978). MSC: 28D05 47A35 PDFBibTeX XML
Istratescu, Vasile I. Some remarks on Hermitian operators. (English) Zbl 0387.47025 Math. Semin. Notes, Kobe Univ. 6, No. 1, 47-50 (1978). MSC: 47B44 46H30 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Math. Semin. Notes, Kobe Univ. 6, No. 1, 47--50 (1978; Zbl 0387.47025)
Istratescu, Vasile I. Local properties of bounded linear operators on Hilbert and Banach spaces. (English) Zbl 0379.47015 Rend. Mat., VI. Ser. 10 (1977), 617-630 (1978). MSC: 47B20 47A25 47A35 47B06 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Rend. Mat., VI. Ser. 10, 617--630 (1978; Zbl 0379.47015)
Istratescu, Vasile I. Some results on M-hyponormal operators. (English) Zbl 0378.47013 Math. Semin. Notes, Kobe Univ. 6, No. 1, 77-86 (1978). MSC: 47B20 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Math. Semin. Notes, Kobe Univ. 6, No. 1, 77--86 (1978; Zbl 0378.47013)
Istratescu, Vasile I. Köthe summing operators. I. (English) Zbl 0479.47013 Math. Balk. 7(1981), 119-132 (1977). MSC: 47B10 47L10 46H10 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Math. Balk. 7, 119--132 (1977; Zbl 0479.47013)
Istratescu, Vasile I. On some classes of operators. II. (English) Zbl 0478.47003 Math. Balk. 7(1981), 133-135 (1977). MSC: 47A15 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Math. Balk. 7, 133--135 (1977; Zbl 0478.47003)
Istratescu, Vasile I. On a class of operators and ergodic theory. II. (English) Zbl 0377.47004 Proc. 5th Conf. Probab. Theory, Brasov 1974, 209-219 (1977). MSC: 47A10 28D05 60J25 PDFBibTeX XML
Istratescu, Vasile I. On some classes of operators. IX. Wellbounded operators of order p. (English) Zbl 0368.47023 Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 61(1976), 37-44 (1977). MSC: 47B40 46E15 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 61, 37--44 (1977; Zbl 0368.47023)
Istratescu, Vasile I.; Istratescu, Ioana I. Some remarks on a class of semigroups of operators. III. (English) Zbl 0367.47022 Proc. 5th Conf. Probab. Theory, Brasov 1974, 221-225 (1977). MSC: 47D03 47B06 28D05 PDFBibTeX XML
Istratescu, Vasile I. A Weierstrass theorem for real Banach spaces. (English) Zbl 0363.41034 J. Approximation Theory 19, 118-122 (1977). MSC: 41A65 41A10 PDFBibTeX XMLCite \textit{V. I. Istratescu}, J. Approx. Theory 19, 118--122 (1977; Zbl 0363.41034) Full Text: DOI
Istratescu, Vasile I.; Istratescu, Ana I. Some results on local power \(\alpha\)-set contractions. I. (English) Zbl 0359.47018 Proc. Conf. Differ. Equat. Appl., Iasi 1973, 9-12 (1977). MSC: 47B99 55M20 47A15 47A53 PDFBibTeX XML
Istratescu, Vasile I. On some subspaces for operators of class \((N, k)\). II. (English) Zbl 0371.47026 Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 60, 763-766 (1976). MSC: 47B20 47A15 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 60, 763--766 (1976; Zbl 0371.47026)
Istratescu, Vasile I. On a functional equation. (English) Zbl 0336.39002 J. Math. Anal. Appl. 56, 133-136 (1976). MSC: 39B05 PDFBibTeX XMLCite \textit{V. I. Istratescu}, J. Math. Anal. Appl. 56, 133--136 (1976; Zbl 0336.39002) Full Text: DOI
Istratescu, Vasile I. On some classes of operators. VII. (English) Zbl 0315.47020 Boll. Unione Mat. Ital., IV. Ser. 11, Suppl. Fasc. 3, 636-640 (1975). MSC: 47B20 47B06 47B15 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Boll. Unione Mat. Ital., IV. Ser. 11, 636--640 (1975; Zbl 0315.47020)
Onicescu, Octav; Istratescu, Vasile I. Approximation theorems for random functions. (English) Zbl 0308.60037 Rend. Mat., VI. Ser. 8, 65-81 (1975). MSC: 60H99 41A65 42A10 PDFBibTeX XMLCite \textit{O. Onicescu} and \textit{V. I. Istratescu}, Rend. Mat., VI. Ser. 8, 65--81 (1975; Zbl 0308.60037)
Istratescu, V. I. Einführung in die Theorie linearer Operatoren. (Introducere in teoria operatorilor liniari.). (Romanian) Zbl 0305.47001 Bucuresti: Editura Academiei Republicii Socialiste Romania. 477 S. Lei 32.00 (1975). MSC: 47-01 47Axx 46Bxx 46Cxx 46H05 47Bxx PDFBibTeX XML
Istratescu, Ana I.; Istratescu, Vasile I. On the existence of a solution of f(x) = kx for a continuous not necessarily linear operator. (English) Zbl 0302.47042 Proc. Am. Math. Soc. 48, 197-198 (1975). MSC: 47H10 47J05 PDFBibTeX XMLCite \textit{A. I. Istratescu} and \textit{V. I. Istratescu}, Proc. Am. Math. Soc. 48, 197--198 (1975; Zbl 0302.47042) Full Text: DOI
Istratescu, Vasile On some commutativity theorems. I. (English) Zbl 0368.46046 An. Stiint. Univ. Al. I. Cuza Iasi, n. Ser., Sect. Ia 20, 309-310 (1974). MSC: 46J05 46H05 PDFBibTeX XMLCite \textit{V. Istratescu}, An. Științ. Univ. Al. I. Cuza Iași, N. Ser., Secț. Ia 20, 309--310 (1974; Zbl 0368.46046)
Istratescu, Vasile I. On functions with bounded variations and an application to kernels of Fredholm equations. I. (English) Zbl 0322.26008 Math. Balk. 4, 271-275 (1974). MSC: 26A45 45B05 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Math. Balk. 4, 271--275 (1974; Zbl 0322.26008)
Istratescu, Vasile Quelques applications remarquables de la theorie des points fixes. (Romanian) Zbl 0317.47039 Gaz. Mat., Bucur., Ser. A 79, 52-58 (1974). MSC: 47H10 47A15 46A20 47J05 PDFBibTeX XMLCite \textit{V. Istratescu}, Gaz. Mat., Bucur., Ser. A 79, 52--58 (1974; Zbl 0317.47039)
Istratescu, Vasile I. On a class of operators and ergodic theory. I. (English) Zbl 0311.47027 Rev. Roum. Math. Pures Appl. 19, 411-420 (1974). MSC: 47J05 47A10 47A35 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Rev. Roum. Math. Pures Appl. 19, 411--420 (1974; Zbl 0311.47027)
Istratescu, V.; Istratescu, I.; Constantin, Gh. On Weyl spectrum of an operator. II. (English) Zbl 0304.47002 Math. Balk. 4, 277-281 (1974). MSC: 47A10 47B15 47C15 PDFBibTeX XMLCite \textit{V. Istratescu} et al., Math. Balk. 4, 277--281 (1974; Zbl 0304.47002)
Istratescu, Vasile I.; Istratescu, Ana I. On some results on locally power \(\alpha\)-set contractions. III. (English) Zbl 0299.47037 Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 56, 197-200 (1974). MSC: 47H99 47J05 PDFBibTeX XMLCite \textit{V. I. Istratescu} and \textit{A. I. Istratescu}, Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 56, 197--200 (1974; Zbl 0299.47037)
Istratescu, Vasile I.; Istratescu, Ana I. Some remarks on a class of semi-groups of operators. II. (English) Zbl 0299.47036 Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 56, 52-54 (1974). MSC: 47H99 PDFBibTeX XMLCite \textit{V. I. Istratescu} and \textit{A. I. Istratescu}, Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 56, 52--54 (1974; Zbl 0299.47036)
Istratescu, Vasile I. Analytic and quasianalytic vectors for some classes of operators. (Romanian) Zbl 0294.46054 Stud. Cercet. Mat. 26, 961-978 (1974). MSC: 46L99 47B25 46J99 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Stud. Cercet. Mat. 26, 961--978 (1974; Zbl 0294.46054)
Istratescu, Vasile I. On a class of operators. VI. (English) Zbl 0276.47026 Rev. Roum. Math. Pures Appl. 19, 17-19 (1974). MSC: 47B20 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Rev. Roum. Math. Pures Appl. 19, 17--19 (1974; Zbl 0276.47026)
Istratescu, Vasile I.; Sacuiu, Ion Fixed point theorems for contraction mappings on probabilistic metric spaces. (English) Zbl 0293.60014 Rev. Roum. Math. Pures Appl. 18, 1375-1380 (1973). MSC: 60B99 46A99 54H25 PDFBibTeX XMLCite \textit{V. I. Istratescu} and \textit{I. Sacuiu}, Rev. Roum. Math. Pures Appl. 18, 1375--1380 (1973; Zbl 0293.60014)
Istratescu, Vasile I. On the theory of classes of special elements in Banach algebras. (English) Zbl 0281.46045 Bull. Math. Soc. Sci. Math. Répub. Soc. Roum., Nouv. Sér. 16(64)(1972), 191-193 (1973). MSC: 46H05 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Bull. Math. Soc. Sci. Math. Répub. Soc. Roum., Nouv. Sér. 16(64), 191--193 (1973; Zbl 0281.46045)
Istratescu, Vasile I. On a measure of noncompactness. (English) Zbl 0278.54031 Bull. Math. Soc. Sci. Math. Répub. Soc. Roum., Nouv. Sér. 16(64)(1972), 195-197 (1973). MSC: 54E99 54H25 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Bull. Math. Soc. Sci. Math. Répub. Soc. Roum., Nouv. Sér. 16(64), 195--197 (1973; Zbl 0278.54031)
Istratescu, Vasile I. On some classes of operators. I. (English) Zbl 0276.47025 Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 52(1972), 868-870 (1973). MSC: 47B20 47B99 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 52, 868--870 (1973; Zbl 0276.47025)
Istratescu, Vasile I.; Istratescu, Ana On the theory of fixed points for some classes of mappings. (English) Zbl 0275.47036 Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 52(1972), 871-874 (1973). MSC: 47H10 PDFBibTeX XMLCite \textit{V. I. Istratescu} and \textit{A. Istratescu}, Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 52, 871--874 (1973; Zbl 0275.47036)
Istratescu, Vasile I. Bemerkungen über den archimedisch bewerteten Körper. (Romanian) Zbl 0273.12104 Gaz. Mat., Bucur., Ser. A 78, 384-385 (1973). MSC: 12D99 12J10 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Gaz. Mat., Bucur., Ser. A 78, 384--385 (1973; Zbl 0273.12104)
Istratescu, Vasile I. Einführung in die Theorie der Fixpunkte. (Introducere in teoria punctelor fixe.). (Romanian) Zbl 0261.47033 Bucuresti: Editura Academiei Republicii Socialiste Romania. 426 p. Lei 15.50 (1973). MSC: 47-02 47H10 55M20 54H25 PDFBibTeX XML
Istratescu, Vasile I. Some remarks on a class of semi-groups of operators. I. (English) Zbl 0246.47046 Z. Wahrscheinlichkeitstheor. Verw. Geb. 26, 241-243 (1973). MSC: 47D03 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Z. Wahrscheinlichkeitstheor. Verw. Geb. 26, 241--243 (1973; Zbl 0246.47046) Full Text: DOI
Istratescu, Vasile I. Symmetrizable operators and their generalizations. I. (Romanian) Zbl 0245.47033 Stud. Cercet. Mat. 24, 1537-1560 (1972). MSC: 47B25 47B15 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Stud. Cercet. Mat. 24, 1537--1560 (1972; Zbl 0245.47033)
Istratescu, Vasile I. On Weyl’s spectrum of an operator. I. (English) Zbl 0245.47032 Rev. Roum. Math. Pures Appl. 17, 1049-1059 (1972). MSC: 47B15 PDFBibTeX XMLCite \textit{V. I. Istratescu}, Rev. Roum. Math. Pures Appl. 17, 1049--1059 (1972; Zbl 0245.47032)
Istratescu, Ana; Istratescu, Vasile On the theory of fixed points for some classes of mappings. VI. (English) Zbl 0244.60005 Rev. Roum. Math. Pures Appl. 17, 1639-1642 (1972). MSC: 60B10 60H99 PDFBibTeX XMLCite \textit{A. Istratescu} and \textit{V. Istratescu}, Rev. Roum. Math. Pures Appl. 17, 1639--1642 (1972; Zbl 0244.60005)
Istratescu, V.; Istratescu, A. On the theory of fixed points for some classes of mappings. IV. (English) Zbl 0239.47041 Bull. Math. Soc. Sci. Math. Répub. Soc. Roum., Nouv. Sér. 15(63)(1971), 33-45 (1972). MSC: 47H10 PDFBibTeX XMLCite \textit{V. Istratescu} and \textit{A. Istratescu}, Bull. Math. Soc. Sci. Math. Répub. Soc. Roum., Nouv. Sér. 15(63), 33--45 (1972; Zbl 0239.47041)
Istratescu, V.; Istratescu, A. On the theory of fixed points for some classes of mappings. I. (English) Zbl 0239.47040 Bull. Math. Soc. Sci. Math. Répub. Soc. Roum., Nouv. Sér. 14(62)(1970), 419-426 (1972). MSC: 47H10 54H25 PDFBibTeX XMLCite \textit{V. Istratescu} and \textit{A. Istratescu}, Bull. Math. Soc. Sci. Math. Répub. Soc. Roum., Nouv. Sér. 14(62), 419--426 (1972; Zbl 0239.47040)
Istrăţescu, Ana; Istrăţescu, Vasile A generalization of collectively compact sets of operators. I. (English) Zbl 0234.47020 Rev. Roum. Math. Pures Appl. 17, 33-37 (1972). MSC: 47B07 47B20 PDFBibTeX XMLCite \textit{A. Istrăţescu} and \textit{V. Istrăţescu}, Rev. Roum. Math. Pures Appl. 17, 33--37 (1972; Zbl 0234.47020)
Istrǎţescu, V. I. On a class of normaloid operators. (English) Zbl 0216.16703 Math. Z. 124, 199-202 (1972). MSC: 47B15 47A10 46C99 PDFBibTeX XMLCite \textit{V. I. Istrǎţescu}, Math. Z. 124, 199--202 (1972; Zbl 0216.16703) Full Text: DOI EuDML
Istratescu, Vasile; Istratescu, Ana On the theory of fixed points for some classes of mappings. V. (English) Zbl 0243.47030 Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 51, 162-167 (1971). MSC: 47H10 54H25 PDFBibTeX XMLCite \textit{V. Istratescu} and \textit{A. Istratescu}, Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 51, 162--167 (1971; Zbl 0243.47030)
Istrăţescu, Ana; Istrăţescu, Vasile On the theory of fixed points for some classes of mappings. II. (English) Zbl 0233.47040 Rev. Roum. Math. Pures Appl. 16, 1073-1076 (1971). MSC: 47H10 PDFBibTeX XMLCite \textit{A. Istrăţescu} and \textit{V. Istrăţescu}, Rev. Roum. Math. Pures Appl. 16, 1073--1076 (1971; Zbl 0233.47040)
Istrăţescu, V.; Istrăţescu, I. On characters of singly generated \(C^ *\)-algebras. (English) Zbl 0227.46063 Proc. Japan Acad. 47, 42-43 (1971). MSC: 46L05 46L35 PDFBibTeX XMLCite \textit{V. Istrăţescu} and \textit{I. Istrăţescu}, Proc. Japan Acad. 47, 42--43 (1971; Zbl 0227.46063) Full Text: DOI
Istrăţescu, V. On the spectra of commutators. (English) Zbl 0214.38204 Rev. Roum. Math. Pures Appl. 16, 51-54 (1971). MSC: 43A99 47B47 PDFBibTeX XMLCite \textit{V. Istrăţescu}, Rev. Roum. Math. Pures Appl. 16, 51--54 (1971; Zbl 0214.38204)
Istrăţescu, V. Verallgemeinerung der Theorie der konvergenten Folgen. (Romanian) Zbl 0214.07802 Gaz. Mat., Bucur., Ser. A 76, 137-144 (1971). MSC: 40A05 47A35 PDFBibTeX XMLCite \textit{V. Istrăţescu}, Gaz. Mat., Bucur., Ser. A 76, 137--144 (1971; Zbl 0214.07802)
Istrăţescu, V.; Istrăţescu, I. On some classes of operators. II. (English) Zbl 0211.44202 Math. Ann. 194, 126-134 (1971). MSC: 47A10 47A05 PDFBibTeX XMLCite \textit{V. Istrăţescu} and \textit{I. Istrăţescu}, Math. Ann. 194, 126--134 (1971; Zbl 0211.44202) Full Text: DOI
Istrătescu, V.; Istrătescu, I. On bare and semibare points for some classes of operators. (English) Zbl 0218.47003 Port. Math. 29, 205-211 (1970). MSC: 47A10 47A12 PDFBibTeX XMLCite \textit{V. Istrătescu} and \textit{I. Istrătescu}, Port. Math. 29, 205--211 (1970; Zbl 0218.47003)
Istrăţescu, V.; Istrăţescu, A. On the theory of fixed points for some classes of mappings. III. (English) Zbl 0213.14802 Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 49, 43-46 (1970). MSC: 47H10 54H25 PDFBibTeX XMLCite \textit{V. Istrăţescu} and \textit{A. Istrăţescu}, Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 49, 43--46 (1970; Zbl 0213.14802)
Istrătescu, V. On dissipative elements in Banach algebras. I. (English) Zbl 0212.16002 Rev. Roum. Math. Pures Appl. 15, 717-720 (1970). MSC: 47B44 47A12 PDFBibTeX XMLCite \textit{V. Istrătescu}, Rev. Roum. Math. Pures Appl. 15, 717--720 (1970; Zbl 0212.16002)
Istrăţescu, V. I. On adjoint abelian operators on Banach spaces. (English) Zbl 0211.44604 Rev. Roum. Math. Pures Appl. 15, 1207-1208 (1970). MSC: 47B15 47A10 46B10 PDFBibTeX XMLCite \textit{V. I. Istrăţescu}, Rev. Roum. Math. Pures Appl. 15, 1207--1208 (1970; Zbl 0211.44604)
Istrăţescu, V.; Bănescu, G. Quelques questions élémentaires de la théorie des nombres. (Romanian) Zbl 0211.06902 Gaz. Mat., Bucur., Ser. A 75, 332-335 (1970). MSC: 11A51 11A41 PDFBibTeX XMLCite \textit{V. Istrăţescu} and \textit{G. Bănescu}, Gaz. Mat., Bucur., Ser. A 75, 332--335 (1970; Zbl 0211.06902)
Istrăţescu, I.; Istrăţescu, V. A note on Weyl’s spectrum of an operator. (English) Zbl 0209.15501 Rev. Roum. Math. Pures Appl. 15, 1445-1447 (1970). MSC: 47A05 47A55 47B20 PDFBibTeX XMLCite \textit{I. Istrăţescu} and \textit{V. Istrăţescu}, Rev. Roum. Math. Pures Appl. 15, 1445--1447 (1970; Zbl 0209.15501)
Istrăţescu, V. I. Some remarks on probabilistic metric spaces. I. (English) Zbl 0208.43403 Rev. Roum. Math. Pures Appl. 15, 985-987 (1970). MSC: 60B99 PDFBibTeX XMLCite \textit{V. I. Istrăţescu}, Rev. Roum. Math. Pures Appl. 15, 985--987 (1970; Zbl 0208.43403)
Istratescu, V. I. A remark on Schwarz norm for operators. (English) Zbl 0197.10204 Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 48, 180-183 (1970). PDFBibTeX XMLCite \textit{V. I. Istratescu}, Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 48, 180--183 (1970; Zbl 0197.10204)
Istratescu, V. On some classes of operators. (English) Zbl 0188.19702 Math. Ann. 188, 227-232 (1970). PDFBibTeX XMLCite \textit{V. Istratescu}, Math. Ann. 188, 227--232 (1970; Zbl 0188.19702) Full Text: DOI EuDML
Istrăţescu, V. On generalized probabilistic metric spaces. I. (English) Zbl 0206.18101 Rev. Roum. Math. Pures Appl. 14, 515-519 (1969). MSC: 60A99 PDFBibTeX XMLCite \textit{V. Istrăţescu}, Rev. Roum. Math. Pures Appl. 14, 515--519 (1969; Zbl 0206.18101)
Istratescu, V. A remark on Schwarz norms for operators. (English) Zbl 0193.42201 Rev. Roum. Math. Pures Appl. 14, 359-360 (1969). PDFBibTeX XMLCite \textit{V. Istratescu}, Rev. Roum. Math. Pures Appl. 14, 359--360 (1969; Zbl 0193.42201)
Istratescu, I.; Istratescu, V. Normaloid operators (II). (Romanian) Zbl 0193.42105 Stud. Cercet. Mat. 21, 937-946 (1969). PDFBibTeX XMLCite \textit{I. Istratescu} and \textit{V. Istratescu}, Stud. Cercet. Mat. 21, 937--946 (1969; Zbl 0193.42105)
Istratescu, V. On a lemma of O’Raifeartaigh and Segal. (English) Zbl 0191.13401 J. Indian Math. Soc., n. Ser. 33, 57-58 (1969). PDFBibTeX XMLCite \textit{V. Istratescu}, J. Indian Math. Soc., New Ser. 33, 57--58 (1969; Zbl 0191.13401)
Istratescu, V. I. On some normaloid operators. (English) Zbl 0188.44203 Rev. Roum. Math. Pures Appl. 14, 1289-1293 (1969). PDFBibTeX XMLCite \textit{V. I. Istratescu}, Rev. Roum. Math. Pures Appl. 14, 1289--1293 (1969; Zbl 0188.44203)
Istratescu, V. On maximum theorems for operator functions. (English) Zbl 0187.06502 Rev. Roum. Math. Pures Appl. 14, 1025-1029 (1969). PDFBibTeX XMLCite \textit{V. Istratescu}, Rev. Roum. Math. Pures Appl. 14, 1025--1029 (1969; Zbl 0187.06502)
Istratescu, V. On Schauder bases. I. (English) Zbl 0185.37303 Rev. Roum. Math. Pures Appl. 14, 49-50 (1969). PDFBibTeX XMLCite \textit{V. Istratescu}, Rev. Roum. Math. Pures Appl. 14, 49--50 (1969; Zbl 0185.37303)
Craiu, V.; Istratescu, V. On classes of summing operators. I. (English) Zbl 0184.35302 Proc. Japan Acad. 45, 380-382 (1969). PDFBibTeX XMLCite \textit{V. Craiu} and \textit{V. Istratescu}, Proc. Japan Acad. 45, 380--382 (1969; Zbl 0184.35302) Full Text: DOI
Istrăţescu, Vasile I. On subharmonicity theorem for operator functions. (English) Zbl 0181.14203 Boll. Unione Mat. Ital., IV. Ser. 2, 365-366 (1969). Reviewer: Vasile I. Istrăţescu MSC: 46-XX PDFBibTeX XMLCite \textit{V. I. Istrăţescu}, Boll. Unione Mat. Ital., IV. Ser. 2, 365--366 (1969; Zbl 0181.14203)
Istratescu, V.; Istratescu, I. On quasi-normalizable operators. I, II. (English) Zbl 0177.41101 Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 46, 345-347, 523-525 (1969). PDFBibTeX XMLCite \textit{V. Istratescu} and \textit{I. Istratescu}, Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 46, 345--347, 523--525 (1969; Zbl 0177.41101)
Istrăţescu, V. A note on hyponormal operators. (English) Zbl 0206.13604 J. Indian Math. Soc., N. Ser. 32, Suppl. 1, 277-279 (1968). MSC: 47B20 PDFBibTeX XMLCite \textit{V. Istrăţescu}, J. Indian Math. Soc., New Ser. 32, 277--279 (1968; Zbl 0206.13604)
Istratescu, V. Weyl’s Theorem for a class of operators. (English) Zbl 0175.13602 Rev. Roum. Math. Pures Appl. 13, 1103-1105 (1968). PDFBibTeX XMLCite \textit{V. Istratescu}, Rev. Roum. Math. Pures Appl. 13, 1103--1105 (1968; Zbl 0175.13602)
Istratescu, V. Hyponormal operators. II. (Romanian) Zbl 0175.13601 Stud. Cercet. Mat. 20, 1159-1168 (1968). PDFBibTeX XMLCite \textit{V. Istratescu}, Stud. Cercet. Mat. 20, 1159--1168 (1968; Zbl 0175.13601)
Istratescu, V. Some remarks on the spectra and numerical range. (English) Zbl 0174.44304 Commentat. Math. Univ. Carol. 9, 527-531 (1968). PDFBibTeX XMLCite \textit{V. Istratescu}, Commentat. Math. Univ. Carol. 9, 527--531 (1968; Zbl 0174.44304) Full Text: EuDML
Istratescu, I.; Istratescu, V. A remark on scattering theory with two Hilbert spaces. (English) Zbl 0172.40804 Rev. Roum. Math. Pures Appl. 13, 1101-1102 (1968). PDFBibTeX XMLCite \textit{I. Istratescu} and \textit{V. Istratescu}, Rev. Roum. Math. Pures Appl. 13, 1101--1102 (1968; Zbl 0172.40804)
Istratescu, V. A remark on a class of power-bounded operators in Hilbert space. (English) Zbl 0172.17101 Acta Sci. Math. 29, 311-312 (1968). PDFBibTeX XMLCite \textit{V. Istratescu}, Acta Sci. Math. 29, 311--312 (1968; Zbl 0172.17101)
Istratescu, V. Note on a theorem of Fuglede and Kleinecke-Shirocov. (English) Zbl 0165.15303 Rev. Roum. Math. Pures Appl. 13, 665-668 (1968). PDFBibTeX XMLCite \textit{V. Istratescu}, Rev. Roum. Math. Pures Appl. 13, 665--668 (1968; Zbl 0165.15303)
Istratescu, V. A note on the spectra of group commutators. (English) Zbl 0165.15302 Boll. Unione Mat. Ital., IV. Ser. 1, 527-529 (1968). PDFBibTeX XMLCite \textit{V. Istratescu}, Boll. Unione Mat. Ital., IV. Ser. 1, 527--529 (1968; Zbl 0165.15302)
Istratescu, V. A note on the variation of spectra. (English) Zbl 0165.15301 Rev. Roum. Math. Pures Appl. 13, 661-664 (1968). PDFBibTeX XMLCite \textit{V. Istratescu}, Rev. Roum. Math. Pures Appl. 13, 661--664 (1968; Zbl 0165.15301)
Istratescu, V.; Istratescu, I. On normaloid operators. (English) Zbl 0159.19403 Math. Z. 105, 153-156 (1968). PDFBibTeX XMLCite \textit{V. Istratescu} and \textit{I. Istratescu}, Math. Z. 105, 153--156 (1968; Zbl 0159.19403) Full Text: DOI EuDML
Istratescu, V.; Istratescu, I. Normaloide Operatoren. (Romanian) Zbl 0159.19402 Stud. Cercet. Mat. 20, 503-509 (1968). PDFBibTeX XMLCite \textit{V. Istratescu} and \textit{I. Istratescu}, Stud. Cercet. Mat. 20, 503--509 (1968; Zbl 0159.19402)
Istratescu, V. On operators of class \((N)\). (English) Zbl 0157.21201 Rev. Roum. Math. Pures Appl. 13, 343-345 (1968). PDFBibTeX XMLCite \textit{V. Istratescu}, Rev. Roum. Math. Pures Appl. 13, 343--345 (1968; Zbl 0157.21201)