Relatórios de Pesquisa

4/1987 Correct Clifford algebra representations of Pauli, Dirac, dotted and undotted two-components spinors
Vera Lúcia Figueiredo, Waldyr A. Rodrigues Jr.
PDF icon rp-1987-04.pdf
3/1987 Best approximants from certain subsets of bounded functions
João B. Prolla
PDF icon rp-1987-03.pdf
2/1987 Chebyshev centers in spaces of continuous functions
João B. Prolla, Ary O. Chiacchio, Maria Sueli M. Roversi
PDF icon rp-2019-02.pdf
1/1987 Approximation by positive elements of subalgebras of real-valued functions
João B. Prolla
PDF icon rp-1987-01.pdf
247/1983 Some applications of non-Hermitian operators in quantum mechanics and quantum field theory
Erasmo Recami, Waldyr A. Rodrigues Jr., Pavel Smrz

Due to the possibility of rephrasing it in terms of Lie-admissible algebras, some work done in the past in collaboration with A. Agodi, M. Baldo and V. S. Olkhvsky is here reported. Such work led to the introduction of non-Hermitian operators in (classical and relativistic) quantum theory. We deal in particular with: (i) the association of unstable states (decaying "Resonances") with the eigenvectors of non-Hermitian Hamiltonians; (ii) the problem of the four-position operators for relativistic spin-zero particles.

PDF icon rp-1983-247.pdf
239/1983 The fundamental equations of minimal surfaces in setC P²
Jost Hinrich Eschenburg, Renato de Azevedo Tribuzy, Irwen Valle Guadalupe
PDF icon rp-1983-239.pdf
210/1982 Best approximation of bounded functions by continuous functions
Maria Sueli Marconi Roversi
PDF icon rp-1982-210.pdf
184/1980 Proper n-valued Lukasiewicz algebras as S-algebras of Lukasiewicz n-valued propositional calculi
Roberto Cignoli
PDF icon rp-1980-184.pdf
183/1980 Dualities for some de Morgan algebras with operators and Lukasiewicz algebras
Roberto Cignoli, Marta S. de Gallego
PDF icon rp-1980-183.pdf
182/1980 An exploratory method for the selection of categorical variables
J. Norberto W. Dachs, Mauro S.F. Marques
PDF icon rp-1980-182.pdf