3,373 research outputs found
Estimates for Fourier sums and eigenvalues of integral operators via multipliers on the sphere
We provide estimates for weighted Fourier sums of integrable functions
defined on the sphere when the weights originate from a multiplier operator
acting on the space where the function belongs. That implies refined estimates
for weighted Fourier sums of integrable kernels on the sphere that satisfy an
abstract H\"{o}lder condition based on a parameterized family of multiplier
operators defining an approximate identity. This general estimation approach
includes an important class of multipliers operators, namely, that defined by
convolutions with zonal measures. The estimates are used to obtain decay rates
for the eigenvalues of positive integral operators on L^2(Sm) and generated by
a kernel satisfying the H\"{o}lder condition based on multiplier operators on
L^2(Sm).Comment: 15 page
Neel order in the two-dimensional S=1/2 Heisenberg Model
The existence of Neel order in the S=1/2 Heisenberg model on the square
lattice at T=0 is shown using inequalities set up by Kennedy, Lieb and Shastry
in combination with high precision Quantum Monte Carlo data.Comment: 4 pages, 1 figur
From Diaspora to Nomadic Identity in the Work of Lispector and Felinto
In her article From Diaspora to Nomadic Identity in the Work of Lispector and Felinto Paula Jordão analyzes Clarice Lispector\u27s A Hora da Estrela (1977; The Hour of the Star, Trans. Giovanni Pontiero, 1992) and Marilene Felinto\u27s As Mulheres de Tijucopapo (1982; The Women of Tijucopapo, trans. Irene Matthews, 1994). Despite being stylistically different, Lispector\u27s A Hora da Estrela and Felinto\u27s As Mulheres de Tijucopapo depict protagonists who share the same social and ethnic background and diasporic identity as women from the Northeast of Brazil. A closer look at the narrative trajectory of these two main characters shows us that they complement each other in the questioning and reformulation of their female identity. Although in a completely different way, they both defy a stereotyped female identity built upon patriarchal standards and put forth a nomadic identity in which memory, trauma, and gender play a central role. As conscious pariahs, they are maybe the promise of the New Brazilian Woman
Sociable housing:new typologies of youth and student housing in a former industrial site in Cologne
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