Results 21 to 30 of about 1,411 (284)

Crossed Product of a C*-Algebra by a Semigroup of Interactions

Demonstratio Mathematica, 2014
The paper presents a construction of the crossed product of a C*-algebra by a commutative semigroup of bounded positive linear maps generated by partial isometries.
Kwaśniewski B. K.
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2-hyperreflexivity and hyporeflexivity of power partial isometries [PDF]

Opuscula Mathematica, 2016
Power partial isometries are not always hyperreflexive neither reflexive. In the present paper it will be shown that power partial isometries are always hyporeflexive and \(2\)-hyperreflexive.
Kamila Piwowarczyk, Marek Ptak
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C *-algebras generated by partial isometries [PDF]

Journal of Applied Mathematics and Computing, 2008
In this paper, we characterize the C*-Algebra generated by partial isometries.
Cho, Ilwoo, Jorgensen, Palle
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A -partial isometries and generalized inverses

Linear Algebra and its Applications, 2013
Let \(A\) be a positive operator in \(B(H)\). One may consider the semi-inner product \(\langle x,y\rangle_A:=\langle Ax, y\rangle\). An operator \(T\in B(H)\) is called \(A\)-adjointable if it is adjointable with respect to \(\langle \cdot,\cdot\rangle_A\). Clearly, an \(A\)-adjoint \(T^\#\) of \(T\) exists if and only if \(AT^\#=T^*A\). Similarly, by
Arias, Maria Laura, Mbekhta, Mostafa
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Towards the non-perturbative cosmological bootstrap

Journal of High Energy Physics, 2023
We study quantum field theory on a de Sitter spacetime dS d+1 background. Our main tool is the Hilbert space decomposition in irreducible unitary representations of its isometry group SO(d + 1, 1). As the first application of the Hilbert space formalism,
Matthijs Hogervorst, Joao Penedones, Kamran Salehi Vaziri   +2 more
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Extensions of symmetric operators I: The inner characteristic function case

Concrete Operators, 2015
Given a symmetric linear transformation on a Hilbert space, a natural problem to consider is the characterization of its set of symmetric extensions. This problem is equivalent to the study of the partial isometric extensions of a fixed partial isometry.
Martin R.T.W.
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Computational Models of Certain Hyperspaces of Quasi-metric Spaces [PDF]

Logical Methods in Computer Science, 2011
In this paper, for a given sequentially Yoneda-complete T_1 quasi-metric space (X,d), the domain theoretic models of the hyperspace K_0(X) of nonempty compact subsets of (X,d) are studied.
Massoud Pourmahdian, Mahdi Ali-Akbari
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A Physically Consistent Model for Forced Torsional Vibrations of Automotive Driveshafts

Computation, 2022
The aim of this research was to design a physically consistent model for the forced torsional vibrations of automotive driveshafts that considered aspects of the following phenomena: excitation due to the transmission of the combustion engine through the
Mihai Bugaru, Andrei Vasile
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On A Novel Topological Space Based On Partially Ordered Ring Of Weak Fuzzy Complex Numbers and Its Relation With The Partially Ordered Neutrosophic Ring of Real Numbers [PDF]

Neutrosophic Sets and Systems
This work is dedicated to studying for the first time a novel topological space generated by weak fuzzy complex intervals based on the partial ordered ring structure of weak fuzzy complex numbers, where we build a topology structure over these intervals.
Raed Hatamleh
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Allometric growth in the skull of Tylosaurus proriger (Squamata: Mosasauridae) and its taxonomic implications

Vertebrate Anatomy, Morphology, Palaeontology, 2018
Ontogeny—the growth and development of an organism—is among the more poorly understood aspects of the life history of mosasaurs, largely owing to a dearth of fossil material from young individuals.
Robert F. Stewart, Jordan Mallon
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