Antieigenvalue bounds

The angle of an operator and positive operator products

Karl Gustafson · Bulletin of the American Mathematical Society · 1968 · 52 citations · Full text

Spectral Theory, Linear Operator, Engineering +3

Angular localization of the spectrum of a multiplicative integral in a Hilbert space

Functional Analysis and Its Applications · 1969 · 47 citations

Spectral Theory, Engineering, Resolvent Kernel +5

Positive (noncommuting) operator products and semigroups

Karl Gustafson · Mathematische Zeitschrift · 1968 · 40 citations

Topological Semigroups, Linear Operator, Operator Products +2

Antieigenvalue inequalities in operator theory

Morteza Seddighin · International Journal of Mathematics and Mathematical Sciences · 2004 · 31 citations · Full text

Linear Operator, Lower Bound, Norm (Mathematics) +5

Numerical range and accretivity of operator products

Karl Gustafson, Duggirala K. M. Rao · Journal of Mathematical Analysis and Applications · 1977 · 25 citations

Linear Operator, Engineering, Interpolation Space +4