Results 21 to 30 of about 441 (58)
Functional calculus for $C_0$-semigroups using infinite-dimensional systems theory [PDF]
, 2015 In this short note we use ideas from systems theory to define a functional calculus for infinitesimal generators of strongly continuous semigroups on a Hilbert space.
Schwenninger, Felix, Zwart, Hans
core +2 more sources
Partially hyper invariant subspaces
, 2012 Between invariance and hyperinvariance are at least two other kinds of partially hyperinvariant subspace. Mathematics subject classification (2010): Primary 47A15; secondary 47A10, 47A60.
S. Djordjević, R. Harte, D. Larson
semanticscholar +1 more source
On positivity and roots in operator algebras [PDF]
, 2014 In earlier papers the second author and Charles Read have introduced and studied a new notion of positivity for operator algebras, with an eye to extending certain C*-algebraic results and theories to more general algebras.
Bearden, Clifford A. +2 more
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Decomposing numerical ranges along with spectral sets
, 2009 This note is to indicate the new sphere of applicability of the method developed by Mlak as well as by the author.
Szafraniec, F. H.
core +1 more source
On a commutative WJ^*-algebra of D_1^+-class and its bicommutant
, 2011 We study different properties of a commutative WJ∗ -algebra in a Krein space that has a maximal non-negative subspace represented as a direct sum of its one-dimensional isotropic subspace and a uniformly positive one.
V. Strauss
semanticscholar +1 more source
The sectorial projection defined from logarithms
, 2011 For a classical elliptic pseudodifferential operator P of order m>0 on a closed manifold X, such that the eigenvalues of the principal symbol p_m(x,\xi) have arguments in \,]\theta,\phi [\, and \,]\phi, \theta +2\pi ...
Grubb, Gerd
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On the spectral mapping theorem for essential spectra [PDF]
, 1985 B. Gramsch and D. Lay have studied spectral mapping theorems for the essential spectra of an operator acting in a complex Banach space. Firstly they consider operators belonging to the Banach algebra of all bounded linear operators on the space, and ...
González Ortiz, Manuel José +1 more
core +2 more sources
Fractional powers of non‐negative operators in Fréchet spaces
, 1988 International Journal of Mathematics and Mathematical Sciences, Volume 12, Issue 2, Page 309-320, 1989.
C. Martinez, M. Sanz, V. Calvo
wiley +1 more source
Linear Fractional PDE, Uniqueness of Global Solutions [PDF]
, 2005 Mathematics Subject Classification: 26A33, 47A60, 30C15.In this paper we treat the question of existence and uniqueness of solutions of linear fractional partial differential equations.
Kempfle, Siegmar +2 more
core
RANGE PROJECTIONS OF IDEMPOTENTS IN C*-ALGEBRAS
, 2001 In this paper we study range projections of idempotents in C*-algebras, and use them to obtain a Schur type decomposition that leads to simple proofs of results on Moore-Penrose inverse and norms of idempotents.
J. J. Koliha
semanticscholar +1 more source