Results 31 to 40 of about 1,411 (284)

Partial isometries in semi-Hilbertian spaces [PDF]

, 2008
In this work, the concepts of isometry, unitary and partial isometry on a Hilbert space are generalized when an additional semi-inner product is considered.
Gonzalez, M. Celeste, M. Celeste Gonzalez, M. Laura Arias, Gustavo Corach, Corach, Gustavo, Gonzalez, Maria Celeste, Arias, M. Laura, Arias, Maria Laura   +7 more
core   +1 more source

Partial translation algebras for trees

, 2009
In [1] we introduced the notion of a partial translation C*-algebra for a discrete metric space. Here we demonstrate that several important classical C*-algebras and extensions arise naturally by considering partial translation algebras associated with ...
Wright, Nick J., Brodzki, Jacek, Niblo, Graham A.   +2 more
core   +1 more source

Ordered ∗-Semigroups and a C∗-Correspondence for a Partial Isometry?

, 2014
. Certain ∗-semigroups are associated with the universal C∗-algebra generated by a partial isometry, which is itself the universal C∗-algebra of a ∗-semigroup. A fundamental role for a ∗-structure on a semigroup is emphasized, and ordered and matricially
Berndt Brenken, Brenken, B.
core   +1 more source

Graev Metrics and Isometry Groups of Polish Ultrametric Spaces [PDF]

, 2013
This dissertation presents results about computations of Graev metrics on free groups and characterizes isometry groups of countable noncompact Heine-Borel Polish ultrametric spaces.
Shi, Xiaohui
core   +1 more source

Partially isometric matrices

, 1967
The complex, not necessarily square matrix A is called a partial isometry if the vectors x and Ax have the same Euclidean norm whenever x is in the orthogonal complement of the null space of A. The main result s of the paper give necessary and sufficient
Hearon, John Z.
core   +1 more source

Characterizations of partial isometries and two special kinds of EP elements [PDF]

, 2020
summary:We give some sufficient and necessary conditions for an element in a ring to be an EP element, partial isometry, normal EP element and strongly EP element by using solutions of certain ...
Yao, Hua, Wei, Junchao, Zhao, Ruju
core   +1 more source

Quasi-isometry and Cohomology & Quan- tisation of Intervals [PDF]

, 2021
Denne afhandling dækker over resultater fra to forskellige projekter.I den første projekt, benytter vi en sætning af Koivisto, Kyed og Raum til at vise at uniform målækvivalens mellem to unimodulære, kompakt frembragte, lokalkompakte anden tællelige ...
Gotfredsen, Thomas
core   +1 more source

On Gradings of the Operator Algebra Generated by Mapping and Multipliers [PDF]

Учёные записки Казанского университета: Серия Физико-математические науки, 2015
The operator algebra generated by mapping on a countable set and multipliers is considered. The defined mapping induces a family of partial isometries satisfying some relations.
E.V. Patrin
doaj  

Factorization of k-quasihyponormal operators

International Journal of Mathematics and Mathematical Sciences, 1991
Let A be the class of all operators T on a Hilbert space H such that R(T*kT), the range space of T*KT, is contained in R(T*k+1), for a positive integer k.
S. C. Arora, J. K. Thukral
doaj   +1 more source

ON SOME APPLICATIONS OF ISOMETRICITY OF FUNCTIONAL SPACES IN APPLIED MATHEMATICS

Міжнародний науково-технічний журнал "Проблеми керування та інформатики", 2020
Problems of computational mathematics are directly connected with an implementation of mathematical models in conditions of limited initial information.
Д.М. Бушев
doaj   +1 more source