Zobrazeno 1 - 10 of 81 pro vyhledávání: '"Providência, João da"'
1
Akademický článek
Approximations for the von Neumann and Rényi entropies of graphs with circulant type Laplacians.
Autor: Bebiano, Natália1, Providência, João da2, Xu, Wei-Ru3 weiruxu@sicnu.edu.cn
Publikováno v: Electronic Research Archive. 2022, Vol. 30 Issue 5, p1-17. 17p.
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2
Akademický článek
An extension of Birkhoff’s theorem with an application to determinants
Autor: Bebiano, Natália, Providência, João da, Kovačec, Alexander
Publikováno v: In Linear Algebra and Its Applications 2007 427(1):130-137
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3
Akademický článek
Quark spin polarization in high density quark matter
Autor: Tsue Yasuhiko, Providência João da, Providência Constança, Yamamura Masatoshi
Publikováno v: EPJ Web of Conferences, Vol 66, p 04029 (2014)
It is shown that there exists a possibility of spontaneous spin polarization in high density symmetric quark matter under the tensor-type four-point interaction between quarks in the Nambu-Jona-Lasinio model. Further, the spontaneous magnetization is
Externí odkaz: https://doaj.org/article/cf1ae95eb8ab4cca871ca7764cbddd04
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4
Fields of values of linear pencils and spectral inclusion regions
Autor: Bebiano, Natália, Providência, João da, Nata, Ana, Providência, J. P. da.
Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::522006cb1a45248e6f38f4a4dfb4609c
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5
The characteristic polynomial of linear pencils of small size and the numerical range
Autor: Bebiano, Natália, Providência, João da, Esmaeili, F.
Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::d355da2c2f5936c728981716dcad7eb8
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6
The EMM and the spectral analysis of a non self-adjoint Hamiltonian on an infinite dimensional Hilbert space
Autor: Bebiano, Natália, Providência, João da
Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::9c0a7bd99196a1c91f9a0f1608e066a7
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7
Revisiting the inverse field of values problema
Autor: Bebiano, Natália, Providência, João da, Nata, Ana, Providência, J. P. da.
Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::62b2f49786063a5710f1a2f7cb032f22
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8
An algorithm for constructing a pseudo-Jacobi matrix from given spectral data
Autor: Bebiano, Natália, Furtado, Susana, Providência, João da
Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::a6ceff637fad1a45d52053327de4cfa5
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9
Convexity of the Krein space tracial numerical range and Morse theory
Autor: Nakazato, Hiroshi, Bebiano, Natália, Providência, João da
Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
In this paper we present a Krein space convexity theorem on the tracial-numerical range of a matrix. This theorem is the analogue of Westwick's theorem. The proof is an application of Morse theory.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::bf13ff8dae42e35eb71326497ccc62bd
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10
Effects of Quark Interactions on Dynamical Chiral Symmetry Breaking by a Magnetic Field
Autor: Hiller, B., Osipov, A.A., Blin, A.H., Providência, João da
It is shown how the strong interaction dynamics of a multi-quark Lagrangian affects the catalysis of dynamical symmetry breaking by a constant magnetic field in (3+1) dimensions. Attention is drawn to the local minima structure of the theory.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______1456::9ee53937d7389431f2ad78a04d1180d1
http://dspace.nbuv.gov.ua/handle/123456789/148981
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