Results 11 to 20 of about 24 (24)

Evolution semigroups for nonautonomous Cauchy problems

Abstract and Applied Analysis, Volume 2, Issue 1-2, Page 73-95, 1997., 1997
In this paper, we characterize wellposedness of nonautonomous, linear Cauchy problems on a Banach space X by the existence of certain evolution semigroups. Then, we use these generation results for evolution semigroups to derive wellposedness for nonautonomous Cauchy problems under some “concrete” conditions.
Gregor Nickel
wiley   +1 more source

Iterative solution of unstable variational inequalities on approximately given sets

Abstract and Applied Analysis, Volume 1, Issue 1, Page 45-64, 1996., 1996
The convergence and the stability of the iterative regularization method for solving variational inequalities with bounded nonsmooth properly monotone (i.e., degenerate) operators in Banach spaces are studied. All the items of the inequality (i.e., the operator A, the “right hand side” f and the set of constraints Ω) are to be perturbed. The connection
Y. I. Alber, A. G. Kartsatos, E. Litsyn
wiley   +1 more source

Bifurcation for the solutions of equations involving set valued mappings

International Journal of Mathematics and Mathematical Sciences, Volume 8, Issue 1, Page 37-48, 1985., 1985
This paper is devoted to a generalization of the bifurcation theorem of Karsnosel′skii and Rabinowitz to the set valued situation.
E. U. Tarafdar, H. B. Thompson
wiley   +1 more source

A theorem on “localized” self‐adjointness of Shrödinger operators with ‐potentials

International Journal of Mathematics and Mathematical Sciences, Volume 5, Issue 3, Page 545-552, 1982., 1982
We prove a result which concludes the self‐adjointness of a Schrödinger operator from the self‐adjointness of the associated “localized” Schrödinger operators having ‐Potentials.
Hans L. Cycon
wiley   +1 more source

Absolute continuity and hyponormal operators

International Journal of Mathematics and Mathematical Sciences, Volume 4, Issue 2, Page 321-335, 1981., 1981
Let T be a completely hyponormal operator, with the rectangular representation T = A + iB, on a separable Hilbert space. If 0 is not an eigenvalue of T* then T also has a polar factorization T = UP, with U unitary. It is known that A, B and U are all absolutely continuous operators.
C. R. Putnam
wiley   +1 more source

Structure of the tree component in an area of riparian forest in the Piratini River Basin, Rio Grande do Sul, Brazil [PDF]

Biotemas, 2009
The vegetation studied belongs to the Pampa biome. The vegetation of this region is described as Open Arboreal Savanna because it presents a herb stratum and an arboreal stratum with a gallery forest.
Luciano Rodrigues Soares, Rogério Soares Ferrer   +1 more
doaj  

Nilpotent perturbations of m-isometric and m-symmetric tensor products of commuting d-tuples of operators

Demonstratio Mathematica
If T1{{\mathbb{T}}}_{1} and T2{{\mathbb{T}}}_{2} are commuting dd-tuples of Hilbert space operators in B(ℋ)dB{\left({\mathcal{ {\mathcal H} }})}^{d} such that (T1*⊗I+I⊗T2*,T1⊗I+I⊗T2)\left({{\mathbb{T}}}_{1}^{* }\otimes I+I\otimes {{\mathbb{T}}}_{2}^{* },{
Duggal Bhagwati Prashad, Kim In Hyoun
doaj   +1 more source

Expansion of eigenvalues of the perturbed discrete bilaplacian. [PDF]

Mon Hefte Math, 2022
Kholmatov SY, Khalkhuzhaev A, Pardabaev M.   +2 more
europepmc   +1 more source

Spectral shift functions and Dirichlet-to-Neumann maps. [PDF]

Math Ann, 2018
Behrndt J, Gesztesy F, Nakamura S.
europepmc   +1 more source

Approximation of eigenvalues for unbounded Jacobi matrices using finite submatrices

Open Mathematics, 2014
Monvel Anne, Zielinski Lech
doaj   +1 more source