1,721,805 research outputs found
О проекциях двумерных дискретных разпределении
No full text[Penkov B.; Penkov Bojan; Penkov Boyan; Пенков Боян]German. Bulgarian, Russian summar
ε-Энтропия и ε-емкость пространства непрерывных функций
No full text[Sendov B.; Sendov Bl.; Sendov Blagovest; Sendow Bl.; Сендов Благовест]; [Penkov B.; Penkov Bojan; Penkov Boyan; Пенков Боян]Bulgarian. Russian, German summar
О поперечниках пространства непрерывных функций
No full text[Sendov Blagowest; Sendov B.; Sendov Bl.; Sendov Blagovest; Sendow Bl.; Сендов Благовест]; [Penkov Bojan; Penkov B.; Penkov Boyan; Пенков Боян]Bulgarian. Russian, German summar
Topological semiinfinite tensor (super)modules
No full textWe construct universal monoidal categories of topological tensor supermodules over the Lie superalgebras gl(V⊕ΠV) and osp(V⊕ΠV) associated with a Tate space V. Here V⊕ΠV is a Z/2Z-graded topological vector space whose even and odd parts are isomorphic to V. We discuss the purely even case first, by introducing monoidal categories Tˆgl(V), Tˆo(V) and Tˆsp(V), and show that these categories are anti-equivalent to respective previously studied categories Tgl(V), To(V), Tsp(V). These latter categories have certain universality properties as monoidal categories, which consequently carry over to Tˆgl(V), Tˆo(V) and Tˆsp(V). Moreover, the categories To(V) and Tsp(V) are known to be equivalent, and this implies the equivalence of the categories Tˆo(V) and Tˆsp(V). After introducing a supersymmetric setting, we establish the equivalence of the category Tˆgl(V) with the category Tˆgl(V⊕ΠV), and the equivalence of both categories Tˆo(V) and Tˆsp(V) with Tˆosp(V⊕ΠV)
MONOGRAPH REVIEW: PENKOV V.F. I WAS BORN ON TUESDAY. TAMBOV: LLC “TSIFRA”, 2015. 148 p
No full textThe reviewed monograph is one of publications, combining the features of memoirs with scientific understanding of recent history events: tragic results of October revolution and Civil War, mobilization of all moral and physical strength of the people in the years of the Great Patriotic War and post war building. The common for V.F. Penkov panorama view on historical reality and deep understanding that the ways of history are made according to one intention is underlined
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Cartan subalgebras of root-reductive Lie algebras
No full textAbstractRoot-reductive Lie algebras are direct limits of finite-dimensional reductive Lie algebras under injections which preserve the root spaces. It is known that a root-reductive Lie algebra is a split extension of an abelian Lie algebra by a direct sum of copies of finite-dimensional simple Lie algebras as well as copies of the three simple infinite-dimensional root-reductive Lie algebras sl∞, so∞, and sp∞. As part of a structure theory program for root-reductive Lie algebras, Cartan subalgebras of the Lie algebra gl∞ were introduced and studied in [K.-H. Neeb, I. Penkov, Cartan subalgebras of gl∞, Canad. Math. Bull. 46 (2003) 597–616].In the present paper we refine and extend the results of [K.-H. Neeb, I. Penkov, Cartan subalgebras of gl∞, Canad. Math. Bull. 46 (2003) 597–616] to the case of a general root-reductive Lie algebra g. We prove that the Cartan subalgebras of g are the centralizers of maximal toral subalgebras and that they are nilpotent and self-normalizing. We also give an explicit description of all Cartan subalgebras of the simple Lie algebras sl∞, so∞, and sp∞.We conclude the paper with a characterization of the set of conjugacy classes of Cartan subalgebras of the Lie algebras gl∞, sl∞, so∞, and sp∞ with respect to the group of automorphisms of the natural representation which preserve the Lie algebra
Variations on the Author
No full text“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
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