245 research outputs found
Walter Rodney y la lucha por el socialismo en Tanzania
No full textThis article proposes a first approximation to the Tanzanian historical process in the vision of Walter Rodney, based on the analysis of some unpublished documents in Spanish, which address the specific situation of its development, in particular, Class Contradiction in Tanzania (1975). Our brief study will consider the Guyanese author as part of a great movement of the African diaspora, which in those years already had a long history and had given rise to some very prominent figures, teachers and fighting comrades of Walter Rodney, and which some social scientists group together, under the name of Black Marxism as part of a Black Radical Tradition. Some biographical data of the pan-African author are mentioned and then some specific characteristics of the independence process in Tanzania are analyzed. Finally, some aspects of Walter Rodney\u27s analysis of the process are addressed.Este artículo se propone una primera aproximación al proceso histórico tanzano en la visión de Walter Rodney, a partir del análisis de algunos documentos inéditos en castellano, que abordan la situación concreta de su desarrollo, en particular, Class Contradiction in Tanzania (1975). Nuestro breve estudio considerará al autor guyanés como parte de un gran movimiento de la diáspora africana, que en aquellos años tenía ya un amplio recorrido y había dado algunas figuras muy destacadas, maestros y compañeros de lucha de Walter Rodney, y que algunos cientistas sociales agrupan bajo el nombre de Marxismo Negro como parte de una Tradición Radical Negra. Se mencionan algunos datos biográficos del autor panafricano y analizan luego algunas características específicas del proceso de independencia en Tanzania. Finalmente, se abordan algunos aspectos del análisis que realizara Walter Rodney sobre el proceso
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No full textThe 18th Annual Walter Rodney Symposium titled: "Democracy Under Duress" took place on Sunday, March 21st, 2021 from 10:00am-3:00pm EST. The Symposium explored the fragility of the democratic state and strategies for creating and protecting a true democracy. This virtual conference is presented by The Walter Rodney Foundation and the AUC Woodruff Library and featured a keynote address by Dr. Angela Y. Davis. The event highlighted Dr. Walter Rodney's and Dr. Angela Y. Davis' lives intersecting when they met at the University of Dar-es-Salaam in Tanzania and their work both grounded in historical truth, and in their commitment to human dignity, liberation, resistance, and scholar-activism. The two panel discussions covered topics of Dr. Walter Rodney, Human Rights, decolonization, imperialism, state violence, and the assassination of Walter Rodney
Positive definiteness of the blended force-based quasicontinuum method
No full textThe development of consistent and stable quasicontinuum models for multidimensional crystalline solids remains a challenge. For example, proving the stability of the force-based quasicontinuum (QCF) model [M. Dobson and M. Luskin, M2AN Math. Model. Numer. Anal., 42 (2008), pp. 113--139] remains an open problem. In one and two dimensions, we show that by blending atomistic and Cauchy--Born continuum forces (instead of a sharp transition as in the QCF method) one obtains positive-definite blended force-based quasicontinuum (B-QCF) models. We establish sharp conditions on the required blending width
Big tight closure test elements for some non-reduced excellent rings
No full textAbstractThis paper is concerned with existence of big tight closure test elements for a commutative Noetherian ring R of prime characteristic p. Let R∘ denote the complement in R of the union of the minimal prime ideals of R. A big test element for R is an element of R∘ which can be used in every tight closure membership test for every R-module, and not just the finitely generated ones. The main results of the paper are that, if R is excellent and satisfies condition (R0), and c∈R∘ is such that Rc is Gorenstein and weakly F-regular, then some power of c is a big test element for R if (i) R is a homomorphic image of an excellent regular ring of characteristic p for which the Frobenius homomorphism is intersection-flat, or (ii) R is F-pure, or (iii) R is local. The Gamma construction is not used
Right and left modules over the Frobenius skew polynomial ring in the f-finite case
No full textAbstractThe main purposes of this paper are to establish and exploit the result that, over a complete (Noetherian) local ringRof prime characteristic for which the Frobenius homomorphismfis finite, the appropriate restrictions of the Matlis-duality functor provide an equivalence between the category of left modules over the Frobenius skew polynomial ringR[x,f] that are Artinian asR-modules and the category of rightR[x,f]-modules that are Noetherian asR-modules.</jats:p
Graded annihilators and tight closure test ideals
No full textAbstractLet R be a commutative Noetherian local ring of prime characteristic p, with maximal ideal m. The main purposes of this paper are to show that if the injective envelope E of R/m has a structure as an x-torsion-free left module over the Frobenius skew polynomial ring over R (in the indeterminate x), then R has a tight closure test element (for modules) and is F-pure, and to relate the test ideal of R to the smallest ‘E-special’ ideal of R of positive height.A byproduct is an analogue of a result of Janet Cowden Vassilev: she showed, in the case where R is an F-pure homomorphic image of an F-finite regular local ring, that there exists a strictly ascending chain 0=τ0⊂τ1⊂⋯⊂τt=R of radical ideals of R such that, for each i=0,…,t−1, the reduced local ring R/τi is F-pure and its test ideal (has positive height and) is exactly τi+1/τi. This paper presents an analogous result in the case where R is complete (but not necessarily F-finite) and E has a structure as an x-torsion-free left module over the Frobenius skew polynomial ring. Whereas Cowden Vassilev's results were based on R. Fedder's criterion for F-purity, the arguments in this paper are based on the author's work on graded annihilators of left modules over the Frobenius skew polynomial ring
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