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Of all publications in the section: 3 714
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Working paper
Kurnosov N., Bogomolov F. A., Buonerba F. math. arxive. Cornell University, 2018
We give a new proof of a theorem of Bogomolov, that the only VII_0 surfaces with b_2=0 are those constructed by Hopf and Inoue. The proof follows the strategy of the original one, but it is of purely group-theoretic nature.
Working paper
Kolpachnikov V. Psychology. PSY. Высшая школа экономики, 2013. No. WP BRP 14/PSY/2013.
This article analyzes Client-Centered (Person-Centered) and Existential approaches in counseling and psychotherapy. The proximity of these approaches, both in theoretical and practical terms, is demonstrated
Working paper
Mikova N. Science, Technology and Innovation. WP BRP. National Research University Higher School of Economics, 2016. No. 65/STI/2016 .
This paper proposes a multidisciplinary approach to understanding the future perspectives of climate change. First, it analyzes the possibilities of using the media as an information source for anticipating trends and challenges in this area through exploring the topics that have been actively discussed in the news in the recent 5 years. Second, qualitative and quantitative approaches are combined in this study in order to identify trends of different categories: social, technological, economic, environmental, political and values/culture. It allows integrating the results of trends monitoring obtained from qualitative and quantitative sources and create a complex map of trends. Qualitative approach is based on the literature review and consultations with the experts, while quantitative analysis includes collecting the news from Factiva database and processing it in Vantage Point software using bibliometric analysis, natural language processing, statistical analysis and principal component analysis. The results shown that 58% of trends were validated by the news and its contribution to the final trends list accounts for 25% on average, which means that the media can be considered as a useful additional data source for validating and updating trends. The results of this multidisciplinary study can be of interest to researchers, economists, business representatives and policy makers that are involved in the climate change related activities.
Working paper
Arkhangelskiy T. Linguistics. WP BRP. НИУ ВШЭ, 2014. No. 10.
The Beserman dialect of the Udmurt language has a large number of clitics, mainly discourse markers, which have never been described in detail. These clitics occur very frequently in texts and often appear in clusters. The rules which govern the ordering of clitics within a cluster are especially interesting because the binary relation “clitic A normally precedes clitic B in a cluster” proves to be intransitive, thus making it impossible to use a clitic template to describe the ordering. In this paper, the rules which govern placement of individual clitics in a sentence and their mutual order in clusters are described. The research is based on a corpus of approximately 64,000 tokens and the authorʼs own field data collected in the village of Shamardan, Yukamensk region, Udmurtia.
Working paper
Fedor Bogomolov, De Oliveira B. arxiv.org. math. Cornell University, 2013
A closed symmetric differential of the 1st kind is a differential that locally is the product of closed holomorphic 1-forms. We show that closed symmetric 2-differentials of the 1st kind on a projective manifold $X$ come from maps of $X$ to cyclic or dihedral quotients of Abelian varieties and that their presence implies that the fundamental group of $X$ (case of rank 2) or of the complement $X\setminus E$ of a divisor $E$ with negative properties (case of rank 1) contains subgroup of finite index with infinite abelianization. Other results include: i) the identification of the differential operator characterizing closed symmetric 2-differentials on surfaces (which provides in this case a connection to flat Riemannian metrics) and ii) projective manifolds $X$ having symmetric 2-differentials $w$ that are the product of two closed meromorphic 1-forms are irregular, in fact if $w$ is not of the 1st kind (which can happen), then $X$ has a fibration $f:X \to C$ over a curve of genus $\ge 1$.
Working paper
Remington T. F. Political Science. PS. Высшая школа экономики, 2017. No. WP BRP 53/PS/2017.
Around the world employers complain of shortages of skilled workers. Meantime, educational and training institutions often function as “bridges to nowhere.” This has implications for both social and economic development. When VET systems are ineffective, they either turn out individuals with skills that are poorly matched to the demands of the labor market, or replicate existing social divisions between rich and poor. Economic inequality, both cross-sectional and spatial, undermines the ability of educational and skill-forming institutions to equalize opportunities for young people to acquire skills usable in the labor market. This bifurcates society between a low-wage, low-skill, often informal employment sector, and a higher-skill, higher-wage sector. This problem has grown more acute everywhere as a result of automation and globalization. For this reason, experts and policy-makers around the world have called for upgrading the quality and effectiveness of vocational education and training (VET), in particular by encouraging closer cooperation between employers and schools. They seek to adapt elements of the German and other continental systems where apprenticeships are the most common pathway leading from school to jobs. Building firm-school partnerships requires overcoming two sets of collective action dilemmas, however: coordinating the interests of firms around setting professional standards and curricular goals, and establishing cooperation between employers and schools. The paper argues that cooperative arrangements vary along two dimensions: the “breadth” of collaboration by schools and firms, i.e. how many firms and schools pool their efforts to upgrade VET; and the “depth” of commitment, that is, how costly is the joint commitment by firms and schools to VET. The evidence suggests that there is typically a trade-off between deepening and broadening. The paper compares China and Russia — two large, relatively decentralized countries with different economic systems — with respect to current efforts to close the gap between skills and jobs. It draws conclusions about the nature of the circumstances under which reforms are likely to result in greater deepening or broadening of cooperation. The paper argues that the formation of effective institutions for resolving collective dilemmas result from government initiatives mobilizing existing capacities to respond to challenges in the external environment
Working paper
Баширов М. А. Law. LAW. Высшая школа экономики, 2013. No. WP BRP 29/LAW/2013.
Сloud computing is treated by most of the experts as one of the main trends of information technologies development for forthcoming years. In present article we focus on general overview of the main aspects of cloud computing services legal regime in Russia. Such aspects include, inter alia, intellectual property and contract law matters, taxation issues, execution of the agreements, warranties and representations under cloud computing agreements and personal data regulations.
Working paper
Malykhin N. I., Ushchev P. Basic research program. WP BRP. National Research University Higher School of Economics, 2016. No. WP BRP 140/EC/2016.
We develop a simple partial-equilibrium model of endogenous city structure formation. No production externalities are at work, the only two forces shaping the spatial configurations of the city being love for variety (on the consumer side) and seeking for a better access to the market (on the firm side). We show that, unlike in existing models of a similar nature, our model generates clustering rather than co-agglomeration. Namely, if there are few firms relative to the urban population size, then firms tend to cluster at the city center, while consumers choose to reside on the outskirts. Otherwise, the opposite holds. Although a continuum of equilibrium city structures may emerge, we show that all spatial equilibria are segregated. In addition, the market outcome features spatial price dispersion, even though our framework does not involve imperfect information and search costs on the consumer side.
Working paper
Bershtein M., Gavrylenko P., Marshakov A. arxiv.org. math. Cornell University, 2018
In this paper the relation between the cluster integrable systems and q-difference equations is extended beyond the Painlevé case. We consider the class of hyperelliptic curves when the Newton polygons contain only four boundary points. The corresponding cluster integrable Toda systems are presented, and their discrete automorphisms are identified with certain reductions of the Hirota difference equation. We also construct non-autonomous versions of these equations and find, that their solutions are expressed in terms of 5d Nekrasov functions with the Chern-Simons contributions, while in the autonomous case these equations are solved in terms of the Riemann theta-functions.
Working paper
Cheltsov I., Kuznetsov A. G., Shramov K. arxiv.org. math. Cornell University, 2018
We construct two small resolutions of singularities of the Coble fourfold (the double cover of the four-dimensional projective space branched over the Igusa quartic). We use them to show that all S_6-invariant three-dimensional quartics are birational to conic bundles over the quintic del Pezzo surface with the discriminant curves from the Wiman-Edge pencil. As an application, we check that S_6-invariant three-dimensional quartics are unirational, obtain new proofs of rationality of four special quartics among them and irrationality of the others, and describe their Weil divisor class groups as S_6-representations.
Working paper
Coppedge M., Gerring J., Knutsen C. H. et al. Working Paper. V-Dem Institute. V-Dem Institute, 2018
Working paper
Priestley Y., Beknazar-Yuzbashev G. PSYCHOLOGY. WP BRP. Издательский дом НИУ ВШЭ, 2015. No. 52.
Political attitudes and positions may tend to change in critical and unstable times, especially for young minds. Social environment of individuals, mostly presented by their social networks, has significant impact on their evaluations. The relationship between political views and social affiliations is difficult to analyze: do people influence each other’s opinions so that they shift over time, or do their political attitudes act as a ground for attraction of individuals to each other and social network construction? In this research, we use longitudinal attitudinal and network data on a sample of one hundred first-year students, analyzed with social network analysis methods and structural-equation modeling. We found tendencies to conformity and shifting individuals’ positions toward the political views of their peers, formed by friendship, rather than by study task ties. Also, political attitudes are appeared to be a driver of relationships formation.
Working paper
Ubozhenko I. Political Science. PS. Высшая школа экономики, 2016
The paper gives the author’s view on the cognitive political discourse analysis procedure by researching the case of teaching creative translation. Of a particular interest is the fact that the research material is based on the example of the discourse analysis of modern political terminology and other non-equivalent vocabulary within the bounds of political contexts. Unlike traditional approaches connecting creativity to literary texts studies, the paper deals with the methodology of comprehending and translating foreign academic and scientific texts. Cognitive study of the aspects of contextual actualization of political concepts in the English and Russian discourses by means of comparative analysis is aimed at professional explanation of motivation in choosing translation equivalents. The algorithm of making up an associative thesaurus based on cognitive signs of lexical marking has been used as the major tool of political discourse analysis as well as the foundation for the original creative model of teaching translation suggested by the author.
Working paper
Sergey Yagolkovskiy. Psychology. PSY. Высшая школа экономики, 2013. No. 11.
We examine how idea exposure produces cognitive stimulation. Study participants were given stimulus ideas with a low or high level of originality, or with absurd content.  Stimuli were exposed in conditions of face-to-face communication and with computer and paper mediation, respectively. Three parameters of creativity were analyzed: Fluency, flexibility, and originality. Results revealed a positive effect on fluency scores for face-to-face communication. This effect is the most evident for the exposure of absurd stimulus ideas. We also found a positive effect on originality scores for highly original stimulus ideas.
Working paper
Khudyakova M., Shapiro Maria M., Grabovskaya M. et al. Linguistics. WP BRP. НИУ ВШЭ, 2016. No. 48.
Coherence is a semantic property of the text to make sense to readers or listeners and is crucial for any text. Various coherence measures have been developed for assessment of discourse abilities in different clinical populations. However, the results of decades of research on coherence of speech of individuals with brain damage have yielded contradictive results. We suggest that this might be due to the different sensitivity of the methods. In this study we two measures of global coherence and five measures of local coherence on the same set of texts by healthy speakers of Russian and people with dynamic aphasia in order to find which methods allow to distinguish between the two groups and how these results correlate. The material for the study is texts from the Russian CliPS corpus which is a collection of oral retellings of the pear film by individuals with brain damage and healthy speakers of Russian language.
Working paper
Alexey Bondal, Ilya Zhdanovskiy. IPMU13-0053. IPMU13-0053. IPMU, 2013
In this article we prove that quasi-free algebra over noetherian ring is coherent. In particular, we get that the category of left finite-presented modules over this algebra is abelian.
Working paper
Positselski L., Efimov A. I. arxiv.org. math. Cornell University, 2013. No. arXiv:1102.0261.
We define the triangulated category of relative singularities of a closed subscheme in a scheme. When the closed subscheme is a Cartier divisor, we consider matrix factorizations of the related section of a line bundle, and their analogues with locally free sheaves replaced by coherent ones. The appropriate exotic derived category of coherent matrix factorizations is then identified with the triangulated category of relative singularities, while the similar exotic derived category of locally free matrix factorizations is its full subcategory. The latter category is identified with the kernel of the direct image functor corresponding to the closed embedding of the zero locus and acting between the conventional (absolute) triangulated categories of singularities. Similar results are obtained for matrix factorizations of infinite rank; and two different "large" versions of the triangulated category of relative singularities, corresponding to the approaches of Orlov and Krause, are identified in the case of a Cartier divisor. Contravariant (coherent) and covariant (quasi-coherent) versions of the Serre-Grothendieck duality theorems for matrix factorizations are established, and pull-backs and push-forwards of matrix factorizations are discussed at length. A number of general results about derived categories of the second kind for CDG-modules over quasi-coherent CDG-algebras are proven on the way. Hochschild (co)homology of matrix factorization categories are discussed in an appendix written in collaboration with A.I. Efimov.
Working paper
Finkelberg M. V., Fujita R. math. arxive. Cornell University, 2019
The convolution ring K^{GL_n(\OOO)⋊ℂ×}(Gr_{GL_n}) was identified with a quantum unipotent cell of the loop group LSL_2 in [Cautis-Williams, arXiv:1801.08111]. We identify the basis formed by the classes of irreducible equivariant perverse coherent sheaves with the dual canonical basis of the quantum unipotent cell.