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Weak contractions and trace class perturbations

Operators and Matrices, 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 (2000): 47L45, 47A45, 47A55, 47B10.
Hari Bercovici, Dan Timotin
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Best Proximity Points for Weak Proximal Contractions

Bulletin of the Malaysian Mathematical Sciences Society, 2014
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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An application of the w-weak generalized contractions theorem

Journal of Fixed Point Theory and Applications, 2019
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Weak closure of the unitary orbit of contractions

Acta Mathematica Hungarica, 1985
Let H be an infinite dimensional complex separable Hilbert space. For a bounded linear operator T(T\(\in L(H))\) on H; U(T), W(T), \(\sigma\) (T), \(\sigma_ e(T)\), WC(U(T)) and \((HB)_ 1\) denote, unitary orbit, numerical range, spectrum, essential spectrum, of T, weak closure of U(T), and set of all contractions on H.
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Weak queen or social contract?

Nature, 1993
Hudson Kern Reeve, Peter Nonacs
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On Almost Type α-F-Z-Weak Contraction in Metric Spaces

Open Journal of Applied Sciences, 2022
Xiao-Lan Liu, Laxmi Rathour
exaly  

On Weak Contractions

Bulletin of the London Mathematical Society, 1981
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Hyperinvariant Subspaces of Weak Contractions. II.

1988
This note is a continuation of [6]. We shall use the terminology and notation of [6]. Recall that an operator T on a (complex separable) Hilbert space H is said to have the property (L) if Hyplat(T) is the smallest complete lattice containing all subspaces of the forms Ker S and \(\overline {{\mathbf{Ran}}} {\text{ S}} = \overline {{\text{SH ...
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Weak Contractions

2010
Béla Sz.-Nagy   +3 more
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