Quasi-homomorphisms

Félix Cabello Sánchez

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Displaying similar documents to “Quasi-homomorphisms”

Quasi-linear maps

D. J. Grubb (2008)

Fundamenta Mathematicae

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A quasi-linear map from a continuous function space C(X) is one which is linear on each singly generated subalgebra. We show that the collection of quasi-linear functionals has a Banach space pre-dual with a natural order. We then investigate quasi-linear maps between two continuous function spaces, classifying them in terms of generalized image transformations.

On quasi-contraction mappings in Banach spaces

B. K. Ray (1978)

Matematički Vesnik

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König-Witstock quasi-norms on quasi-Banach spaces.

Jesús M. Fernández Castillo, Yolanda Moreno (2002)

Extracta Mathematicae

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Linear maps preserving quasi-commutativity

Heydar Radjavi, Peter Šemrl (2008)

Studia Mathematica

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Let X and Y be Banach spaces and ℬ(X) and ℬ(Y) the algebras of all bounded linear operators on X and Y, respectively. We say that A,B ∈ ℬ(X) quasi-commute if there exists a nonzero scalar ω such that AB = ωBA. We characterize bijective linear maps ϕ : ℬ(X) → ℬ(Y) preserving quasi-commutativity. In fact, such a characterization can be proved for much more general algebras. In the finite-dimensional case the same result can be obtained without the bijectivity assumption.

A property of quasi-complements

Robert H. Lohman (1974)

Colloquium Mathematicae

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Nonlinear metric projections in twisted twilight.

Félix Cabello Sánchez, Jesús M. F. Castillo, Fernando Sánchez (2000)

Revista de la Real Academia de Ciencias Exactas Físicas y Naturales

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A generalization of Ćirić quasi-contraction

T. K. Pal, M. Maiti (1977)

Matematički Vesnik

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Convexity, type and three space problem

Nigel Kalton (1981)

Studia Mathematica

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On the geometric definition of the quasi-conformality

Cabiria Andreian Cazacu (1981)

Annales Polonici Mathematici

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Bayoumi quasi-differential is not different from Fréchet-differential

Fernando Albiac, José Ansorena (2012)

Open Mathematics

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Unlike for Banach spaces, the differentiability of functions between infinite-dimensional nonlocally convex spaces has not yet been properly studied or understood. In a paper published in this Journal in 2006, Bayoumi claimed to have discovered a new notion of derivative that was more suitable for all F-spaces including the locally convex ones with a wider potential in analysis and applied mathematics than the Fréchet derivative. The aim of this short note is to dispel this misconception,...

The basic sequence problem

N. Kalton (1995)

Studia Mathematica

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We construct a quasi-Banach space X which contains no basic sequence.

Quasi-inverses of morphisms

Roman Sikorski (1974)

Fundamenta Mathematicae

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Generation of Quasi-Moiré Patterns: Fractality and Percolation

Pablo F. Meilán, Mariano Creus, Mario Garavaglia (2000)

Visual Mathematics

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Versatile asymmetrical tight extensions

Olivier Olela Otafudu, Zechariah Mushaandja (2017)

Topological Algebra and its Applications

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We show that the image of a q-hyperconvex quasi-metric space under a retraction is q-hyperconvex. Furthermore, we establish that quasi-tightness and quasi-essentiality of an extension of a T0-quasi-metric space are equivalent.