Results 71 to 80 of about 633 (85)
Estimating eigenvalues of matrices by induced norms
, 2011 A classical result of Konig in terms of matrices states that for 1 p 0 not depending on the matrix A , where ‖A‖q,p denotes the norm of A viewed as an operator from q into n p .
C. Michels
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Study of a differential operator of Heun type arising in fluid dynamics
, 2009 The paper studies the non-selfadjoint linear differential operator Ly = d dt ( (1−acos t)y+bsin t dy dt ) acting in the Hilbert space L2(−π,π) that originated from a steady state stability problem in fluid dynamics.
M. Chugunova, H. Volkmer
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On the range kernel orthogonality and p-symmetric operators
, 2006 Let H be a separable infinite dimensional complex Hilbert space, and let L(H) denote the algebra of all bounded linear operators on H . For given A ∈ L(H) , we define the derivation δA : L(H) −→ L(H) by δA(X) = AX − XA .
S. Bouali, Y. Bouhafsi
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The Price of the Plot in Aristotle's Poetics
, 2006 Plato's critique of "the imitative tribe" in Book X of Republic calls for a defense of poetry, and Aristotle initiates that effort in Poetics. Taking his cue from Plato, he makes imitation the key concept and thus associates poetry with other kinds of ...
R. Seamon
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Weak contractions and trace class perturbations
, 2007 An absolutely continuous contraction is said to be in the class A if it has isometric H∞ functional calculus. We present evidence in favor of the conjecture that the class A is invariant under trace-class perturbations. Mathematics subject classification
H. Bercovici, D. Timotin
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Characterization of nuclear pseudo-multipliers associated to the harmonic oscillator
, 2018 In this paper we study pseudo-multipliers associated to the harmonic oscillator (also called Hermite multipliers) belonging to the ideal of $r$-nuclear operators on Lebesgue spaces.Comment: arXiv admin note: substantial text overlap with arXiv:1709 ...
Barraza, Edgardo, Cardona, Duván
core
Spectral characterization of sums of commutators I
, 1997 Suppose $\Cal J$ is a two-sided quasi-Banach ideal of compact operators on a separable infinite-dimensional Hilbert space $\Cal H$. We show that an operator $T\in\Cal J$ can be expressed as finite linear combination of commutators $[A,B]$ where $A\in\Cal
Kalton, Nigel J.
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Spectral shift functions and Dirichlet-to-Neumann maps. [PDF]
Math Ann, 2018 Behrndt J, Gesztesy F, Nakamura S.
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UNBOUNDED 2-HYPEREXPANSIVE OPERATORS
Proceedings of the Edinburgh Mathematical Society, 2001 Z. Jablonski, J. Stochel
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UNBOUNDEDNESS OF THE BERGMAN PROJECTIONS ON $L^{p}$ SPACES WITH EXPONENTIAL WEIGHTS
Proceedings of the Edinburgh Mathematical Society, 2004 M. Dostanic
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