1,720,967 research outputs found
Soluble pro-p-groups and soluble Lie algebras
No full textWe present here some recent work on the correspondence between normal subgroups of profinite groups and graded ideals of their associated graded Lie algebras, and give characterizations of soluble just infinite pro-p-groups and modular soluble just infinite graded Lie algebras
ISCHIA GROUP THEORY 2008, Proceedings of the Conference, Ischia, Naples, Italy, 1-4 April 2008.
No full textIschia Group Theory 2010: Proceedings of the Conference, Ischia, Naples, Italy, 14-17 April, 2010
No full textJust infinite periodic Lie algebras
No full textIn this paper we give a characterization of just infinite Lie subalgebras of a loop algebra in terms of the existence of certain ideals and in terms of the existence of certain nontrivial L-endomorphisms of positive degree. Such an algebra has a faithful representation of finite degree over the ring of polynomials with coefficients in the ground field, and is shown to be ideally r-constrained for a suitable r. An upper bound for r is given in the solvable case
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Pro-p groups with few normal subgroups
Full text linkMotivated by the study of pro-p groups With finite coclass, we consider the class of pro-p groups with few normal subgroups. This is not a well defined class and we offer several different definitions and study the connections between them. Furthermore, we propose a definition of periodicity for pro-p groups, thus, providing a general framework for some periodic patterns that have already been observed in the existing literature. We then focus oil examples and show that strikingly all the interesting examples not only have few normal Subgroups, but in addition have periodicity in the lattice of normal subgroups. (C) 2008 Elsevier Inc. All rights reserved
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