Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Luz Maria Dealba"'
Autor:
Olga Pryporova, Leslie Hogben, Irvin Roy Hentzel, Luz Maria DeAlba, Kevin N. Vander Meulen, Judith J. McDonald, Rana Mikkelson, Bryan L. Shader
Publikováno v:
Linear Algebra and its Applications. 423:262-276
A sign pattern Z (a matrix whose entries are elements of {+,−,0}) is spectrally arbitrary if for any self-conjugate spectrum there is a real matrix with sign pattern Z having the given spectrum. Spectrally arbitrary sign patterns were introduced in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9c5bedb9c26ff046fe288aa2cc8888c5
https://doi.org/10.1016/j.laa.2006.12.018
https://doi.org/10.1016/j.laa.2006.12.018
Publikováno v:
Linear Algebra and its Applications. 418:394-415
The set of real matrices described by a sign pattern (a matrix whose entries are elements of {+, −, 0}) has been studied extensively but only loose bounds were available for the minimum rank of a tree sign pattern. A simple graph has been associate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e0c017838e733cb96573640b3c4063b0
https://doi.org/10.1016/j.laa.2006.02.018
https://doi.org/10.1016/j.laa.2006.02.018
Autor:
Luz Maria Dealba
Publikováno v:
International Journal of Mathematical Education in Science and Technology. 33:96-111
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b583c837c94730cd7719836c91ae74f
https://doi.org/10.1080/00207390210212
https://doi.org/10.1080/00207390210212
Autor:
Leslie Hogben, Luz Maria DeAlba
Publikováno v:
Linear Algebra and its Applications. 319:83-102
A list of positions in an n × n real matrix (a pattern) is said to have M - completion if every partial M -matrix that specifies exactly these positions can be completed to an M -matrix. Let Q be a pattern that includes all diagonal entries and let
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::258d9a2b0c3e344c0f28519dcb1b2264
https://doi.org/10.1016/s0024-3795(00)00167-1
https://doi.org/10.1016/s0024-3795(00)00167-1
Publikováno v:
Linear Algebra and its Applications. 268:151-169
Some familiar classes of stable Hilbert-space operators are studied to determine how they overlap and where the unitary similarity classes of their members lie. Analogous, but less familiar, classes of convergent operators are examined with the same
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::51399c542ff486a0a6595104f276393e
Autor:
Luz Maria DeAlba, Milan Randić
Publikováno v:
Journal of Chemical Information and Computer Sciences. 37:1078-1081
We consider rigorous definitions for dense graphs and sparse matrices, thus quantifying these concepts that have been hitherto used in a qualitative manner. We assign to every graph the compactness...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::990927e5d545047d6ecb998e2c154736
https://doi.org/10.1021/ci970241z
https://doi.org/10.1021/ci970241z
Autor:
Amy Wangsness Wehe, Luz Maria DeAlba
Publikováno v:
Discrete Mathematics and Its Applications ISBN: 9781466507289
Handbook of Linear Algebra, Second Edition
Handbook of Linear Algebra, Second Edition
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6f16e06d12a19157520b3988f99a271a
https://doi.org/10.1201/b16113-56
https://doi.org/10.1201/b16113-56
Autor:
Luz Maria DeAlba
Publikováno v:
Linear Algebra and its Applications. :191-201
Let A be an n-by-n nonderogatory matrix all of whose eigenvalues lie on the unit circle, and let π and ν be nonnegative integers with π + ν = n. Let π′ and ν′ be positive integers and δ′ a nonnegative integer with π′ + ν′ + δ′ =
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0526f3d63be3fde712a5a1ad10b1a453
https://doi.org/10.1016/0024-3795(95)00546-3
https://doi.org/10.1016/0024-3795(95)00546-3
Autor:
Charles R. Johnson, Luz Maria DeAlba
Publikováno v:
Linear Algebra and its Applications. 222:227-240
In the Stein (or, equivalently, the Lyapunov) equation, we show that the only joint constraints on the inertias of the three matrices are the classical definiteness and semidefiniteness constraints and a simple rank-related constraint.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d5af66071958ed64d52496fd30c1742d
https://doi.org/10.1016/0024-3795(93)00296-c
https://doi.org/10.1016/0024-3795(93)00296-c