UBER DEN NUMERISCHEN WERTEBEREICH EINES OPERATORS

[1] Bauer F.L., 1962, NUMER MATH, V4, P103

[2] Donoghue WF., 1957, MICH MATH J, V4, P261

[3] DONOGHUE WF, 1963, PUBL MATH, V16, P31

[4] Dunford N., 1958, LINEAR OPERATORS I

[5] FIELDS OF VALUES OF A MATRIX [J]. PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, 1952, 3 (02) : 206 - 209

[6] Halmos P.R., 1964, ACTA SCI MATH, V25, P1

[7] CLOSURE OF NUMERICAL RANGE OF OPERATOR AS SPECTRAL SET [J]. COMMUNICATIONS ON PURE AND APPLIED MATHEMATICS, 1964, 17 (04) : 415 - &

[8] HILDEBRANDT S., 1965, ACTA SCI MATH, V26, P187

[9] Kippenhahn R., 1951, MATH NACHR, V6, P193

[10] Meng C-H, 1957, P AM MATH SOC, V8, P85, DOI [10.1090/S0002-9939-1957-0094711-2, DOI 10.1090/S0002-9939-1957-0094711-2]

[1] Bauer F.L., 1962, NUMER MATH, V4, P103

[2] Donoghue WF., 1957, MICH MATH J, V4, P261

[3] DONOGHUE WF, 1963, PUBL MATH, V16, P31

[4] Dunford N., 1958, LINEAR OPERATORS I

[5] FIELDS OF VALUES OF A MATRIX [J]. PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, 1952, 3 (02) : 206 - 209

[6] Halmos P.R., 1964, ACTA SCI MATH, V25, P1

[7] CLOSURE OF NUMERICAL RANGE OF OPERATOR AS SPECTRAL SET [J]. COMMUNICATIONS ON PURE AND APPLIED MATHEMATICS, 1964, 17 (04) : 415 - &

[8] HILDEBRANDT S., 1965, ACTA SCI MATH, V26, P187

[9] Kippenhahn R., 1951, MATH NACHR, V6, P193

[10] Meng C-H, 1957, P AM MATH SOC, V8, P85, DOI [10.1090/S0002-9939-1957-0094711-2, DOI 10.1090/S0002-9939-1957-0094711-2]