Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Tiberiu Constantinescu"'
Publikováno v:
Mathematische Nachrichten. 171:79-94
An indefinite trigonometric moment problem is solved using the one-step completion and the geometry involved in extending factorizations in Krein spaces. In addition, a description of all the solutions is obtained as well as a simple characterization
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::92661c18c58f7017dee0d0dedc688c05
https://doi.org/10.1002/mana.19951710106
https://doi.org/10.1002/mana.19951710106
Autor:
Viswanath Ramakrishna, N. Spears, Tiberiu Constantinescu, Issa M. S. Panahi, Louis R. Hunt, Govind Kannan, Jian Tong, Duncan L. MacFarlane
Publikováno v:
Journal of Lightwave Technology. 24:2637-2648
A signal processing approach to modeling, analyzing, and synthesizing a particular integrated photonic architecture of optical filters with tunable gains is presented. This particular architecture has two-port couplers and current-controlled semicond
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a70ba0692d956c5213b3d113119ce914
https://doi.org/10.1109/jlt.2006.875233
https://doi.org/10.1109/jlt.2006.875233
Publikováno v:
Quantum Information Processing. 2:221-248
This work describes one parametrization of quantum states and channels and several of its possible applications. This parametrization works in any dimension and there is an explicit algorithm which produces it. Included in the list of applications ar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f23e3f1ee2caedcfaae4b7b7fac8486d
https://doi.org/10.1023/b:qinp.0000004126.72103.c5
https://doi.org/10.1023/b:qinp.0000004126.72103.c5
Publikováno v:
IFAC Proceedings Volumes. 36:301-304
This work provides explicit parametrizations of unit trace, positive semidefinite matrices operating in low dimensions. It also characterizes those positive matrices which are projections. Two distinct types of parametrizations are provided. Neither
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6ca24c27a574f9374306179043a5ebd0
https://doi.org/10.1016/s1474-6670(17)38909-7
https://doi.org/10.1016/s1474-6670(17)38909-7
Publikováno v:
Linear Algebra and its Applications. :147-169
This paper deals with a general matrix extension problem with structural constraints and provides a recursive solution in terms of an inverse scattering experiment. Both the stationary and nonstationary cases are considered, in addition to connection
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0dd4182ef5c3655beaf623f3e716097f
Autor:
Tiberiu Constantinescu, J. L. Johnson
Publikováno v:
Zeitschrift für Analysis und ihre Anwendungen. 21:3-20
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c686d28e9d6694c4dd55396d7c1834b4
https://doi.org/10.4171/zaa/1062
https://doi.org/10.4171/zaa/1062
Autor:
J. L. Johnson, Tiberiu Constantinescu
Publikováno v:
Zeitschrift für Analysis und ihre Anwendungen. 21:611-626
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a729c1e1d0ba1ba82c6b9e7bc7630330
https://doi.org/10.4171/zaa/1098
https://doi.org/10.4171/zaa/1098
Publikováno v:
Quantum Information Processing. 1:409-424
This work provides, constructively, explicit one–one parametrizations of all purifications of a mixed state in dimension 2 and all joint purifications, if any, of two mixed states in the same dimension. The former is parametrized by SO(3, R), while
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f5dbaba0cca1351546781415ae7d8019
https://doi.org/10.1023/a:1023473931663
https://doi.org/10.1023/a:1023473931663
Publikováno v:
Comptes Rendus de l'Académie des Sciences - Series I - Mathematics. 331:797-802
We study Hermitian kernels invariant under the action of a semigroup with involution. We characterize the Hermitian kernels that realize the given action by bounded operators on a Krein space. Applications include the GNS representation of ∗ -algeb
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8c7d89be79a0777e96bc5f3d130ee882
https://doi.org/10.1016/s0764-4442(00)01708-0
https://doi.org/10.1016/s0764-4442(00)01708-0
Publikováno v:
Proceedings of the American Mathematical Society. 128:2705-2713
In this paper we analyze the existence of a Schur algorithm and obtain coefficient characterizations for the functions in a generalized Schur class. An application to an interpolation problem of Caratheodory type raised by M.G. Krĕin and H. Langer i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6f5d804084f1db4255f90ab99442c568
https://doi.org/10.1090/s0002-9939-00-05375-2
https://doi.org/10.1090/s0002-9939-00-05375-2