نتایج جستجو برای: approximate point spectrum

تعداد نتایج: 800092  

Journal: :iranian journal of science and technology (sciences) 2011
n. durna

there are many different ways to subdivide the spectrum of a bounded linear operator; some of them aremotivated by applications to physics (in particular, quantum mechanics). in this study, the relationship betweenthe subdivisions of spectrum which are not required to be disjoint and goldberg's classification are given.moreover, these subdivisions for some summability methods are studied.

Journal: :Transactions of the American Mathematical Society 1970

Journal: :Journal of Mathematical Analysis and Applications 2011

H.R. Afshin, M.A. Ranjbar,

Basic relation between numerical range and Davis-Wielandt shell of an operator $A$ acting on a Hilbert space with orthonormal basis $xi={e_{i}|i in I}$ and its conjugate $bar{A}$ which is introduced in this paper are obtained. The results are used to study the relation between point spectrum, approximate spectrum and residual spectrum of $A$ and $bar{A}$. A necessary and sufficient condition fo...

Journal: :نظریه تقریب و کاربرد های آن 0
ُs. a. m mohsenalhoseini valie-asr university h mazaheri islamic azad university of yazd

the purpose of this paper is to obtain necessary and suffcient conditionsfor existence approximate fi xed point on geraghty-contraction. in this paper,de nitions of approximate -pair fi xed point for two maps t α , sα and theirdiameters are given in a metric space.

Journal: :Hokkaido Mathematical Journal 2002

Journal: :Bulletin of the American Mathematical Society 1974

Journal: :iranian journal of fuzzy systems 2013
s. a. m. mohseniailhosseini h. mazaheri m. a. dehghan

we de ne approximate xed point in fuzzy norm spaces and prove the existence theorems, we also consider approximate pair constructive map- ping and show its relation with approximate fuzzy xed point.

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