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$Q$ -functions on quasimetric spaces and fixed points for multivalued maps.

Marín, J., Romaguera, S., Tirado, P. (2011)

Fixed Point Theory and Applications [electronic only]

Quadratic optimization of fixed points for a family of nonexpansive mappings in Hilbert space.

Rhoades, B.E. (2004)

Fixed Point Theory and Applications [electronic only]

Quantification of the reciprocal Dunford-Pettis property

Ondřej F. K. Kalenda, Jiří Spurný (2012)

Studia Mathematica

We prove in particular that Banach spaces of the form C₀(Ω), where Ω is a locally compact space, enjoy a quantitative version of the reciprocal Dunford-Pettis property.

Quasicone metric spaces and generalizations of Caristi Kirk's theorem.

Abdeljawad, Thabet, Karapinar, Erdal (2009)

Fixed Point Theory and Applications [electronic only]

Quasi-constricted linear operators on Banach spaces

Eduard Yu. Emel'yanov, Manfred P. H. Wolff (2001)

Studia Mathematica

Let X be a Banach space over ℂ. The bounded linear operator T on X is called quasi-constricted if the subspace $X ₀ : = x \in X : l i m_{n \to \infty} | | T ⁿ x | | = 0$ is closed and has finite codimension. We show that a power bounded linear operator T ∈ L(X) is quasi-constricted iff it has an attractor A with Hausdorff measure of noncompactness $χ_{| | \cdot | | ₁} (A) < 1$ for some equivalent norm ||·||₁ on X. Moreover, we characterize the essential spectral radius of an arbitrary bounded operator T by quasi-constrictedness of scalar multiples of T. Finally, we prove that every...