SOME CONDITIONS ON AN OPERATOR IMPLYING NORMALITY

[1] Ando T., 1963, P AM MATH SOC, V14, P290

[2] BERBERIAN SK, 1961, INTRODUCTION HILBERT

[3] BERNAU SJ, 1963, P CAMB PHILOS SOC, V59, P727

[4] A NECESSARY AND SUFFICIENT CONDITION THAT AN OPERATOR BE NORMAL [J]. JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, 1968, 22 (01) : 10 - &

[5] Halmos PR., 1982, HILBERT SPACE PROBLE

[6] UBER DEN NUMERISCHEN WERTEBEREICH EINES OPERATORS [J]. MATHEMATISCHE ANNALEN, 1966, 163 (03) : 230 - +

[7] LORCH ER, 1962, SPECTRAL THEORY

[8] RIESZ F, 1952, LECONS DANALYSE FONC

[9] SAITO T, 1965, TOHOKU MATH J, V17, P147

[10] HYPONORMAL OPERATORS [J]. PACIFIC JOURNAL OF MATHEMATICS, 1962, 12 (04) : 1453 - &

[1] Ando T., 1963, P AM MATH SOC, V14, P290

[2] BERBERIAN SK, 1961, INTRODUCTION HILBERT

[3] BERNAU SJ, 1963, P CAMB PHILOS SOC, V59, P727

[4] A NECESSARY AND SUFFICIENT CONDITION THAT AN OPERATOR BE NORMAL [J]. JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, 1968, 22 (01) : 10 - &

[5] Halmos PR., 1982, HILBERT SPACE PROBLE

[6] UBER DEN NUMERISCHEN WERTEBEREICH EINES OPERATORS [J]. MATHEMATISCHE ANNALEN, 1966, 163 (03) : 230 - +

[7] LORCH ER, 1962, SPECTRAL THEORY

[8] RIESZ F, 1952, LECONS DANALYSE FONC

[9] SAITO T, 1965, TOHOKU MATH J, V17, P147

[10] HYPONORMAL OPERATORS [J]. PACIFIC JOURNAL OF MATHEMATICS, 1962, 12 (04) : 1453 - &