An exhibition of one’s own: the Salón Femenino de Bellas Artes (Buenos Aires, 1930s-1940s)

From the late 1920s on, Buenos Aires witnessed the emergence of exhibition spaces of a separatist character for women artists. In spite of their importance, these regular shows have not received any attention from art history literature. Their vast development, the extensive coverage by the press, and their links to feminist institutions have gone completely unnoticed. Focusing on the Salón Femenino organized by the Club Argentino de Mujeres, the purpose of this article is to reconstruct the organization of these events, to examine their reception by art critics, and to analyze the careers of some of the participating women artists. These forgotten exhibitions offer a new perspective for the analysis of a period of intense feminine artistic activity in Argentina

Self-similar Approximants of the Permeability in Heterogeneous Porous Media from Moment Equation Expansions

We use a mathematical technique, the self-similar functional renormalization, to construct formulas for the average conductivity that apply for large heterogeneity, based on perturbative expansions in powers of a small parameter, usually the log-variance $\sigma_Y^2$ of the local conductivity. Using perturbation expansions up to third order and fourth order in $\sigma_Y^2$ obtained from the moment equation approach, we construct the general functional dependence of the transport variables in the regime where $\sigma_Y^2$ is of order 1 and larger than 1. Comparison with available numerical simulations give encouraging results and show that the proposed method provides significant improvements over available expansions.Comment: Latex, 14 pages + 5 ps figure

Podría ser yo. Los sectores populares urbanos en imagen y palabra, Elizabeth Jelin y Pablo Vila con fotografías de Alicia D’Amico, Buenos Aires, Asunción, 2019, 153 páginas. Edición doble con un nuevo volumen de ensayos de Sergio Caggiano, Ludmila Da Silva Catela, Elizabeth Jelin, Francisco Medail, Juan Cruz Pedroni, Agustina Triquell y Pablo Villa, 112 páginas.

Podría ser yo. Los sectores populares urbanos en imagen y palabra, de Elizabeth Jelin y Pablo Vila con fotografías de Alicia D’Amico, Buenos Aires, Asunción, 2019, 153 páginas. Edición doble con un nuevo volumen de ensayos de Sergio Caggiano, Ludmila Da Silva Catela, Elizabeth Jelin, Francisco Medail, Juan Cruz Pedroni, Agustina Triquell y Pablo Villa, 112 páginas. La reedición de Podría ser yo. Los sectores populares urbanos en imagen y palabra, impulsada por la editorial especializada en fo..

Classification of Possible Finite-Time Singularities by Functional Renormalization

Starting from a representation of the early time evolution of a dynamical system in terms of the polynomial expression of some observable f (t) as a function of the time variable in some interval 0 < t < T, we investigate how to extrapolate/forecast in some optimal stability sense the future evolution of f(t) for time t>T. Using the functional renormalization of Yukalov and Gluzman, we offer a general classification of the possible regimes that can be defined based on the sole knowledge of the coefficients of a second-order polynomial representation of the dynamics. In particular, we investigate the conditions for the occurence of finite-time singularities from the structure of the time series, and quantify the critical time and the functional nature of the singularity when present. We also describe the regimes when a smooth extremum replaces the singularity and determine its position and amplitude. This extends previous works by (1) quantifying the stability of the functional renormalization method more accurately, (2) introducing new global constraints in terms of moments and (3) going beyond the ``mean-field'' approximation.Comment: Latex document of 18 pages + 7 ps figure

Self-Similar Factor Approximants

The problem of reconstructing functions from their asymptotic expansions in powers of a small variable is addressed by deriving a novel type of approximants. The derivation is based on the self-similar approximation theory, which presents the passage from one approximant to another as the motion realized by a dynamical system with the property of group self-similarity. The derived approximants, because of their form, are named the self-similar factor approximants. These complement the obtained earlier self-similar exponential approximants and self-similar root approximants. The specific feature of the self-similar factor approximants is that their control functions, providing convergence of the computational algorithm, are completely defined from the accuracy-through-order conditions. These approximants contain the Pade approximants as a particular case, and in some limit they can be reduced to the self-similar exponential approximants previously introduced by two of us. It is proved that the self-similar factor approximants are able to reproduce exactly a wide class of functions which include a variety of transcendental functions. For other functions, not pertaining to this exactly reproducible class, the factor approximants provide very accurate approximations, whose accuracy surpasses significantly that of the most accurate Pade approximants. This is illustrated by a number of examples showing the generality and accuracy of the factor approximants even when conventional techniques meet serious difficulties.Comment: 22 pages + 11 ps figure