• A
  • A
  • A
  • ABC
  • ABC
  • ABC
  • А
  • А
  • А
  • А
  • А
Regular version of the site
Of all publications in the section: 3 644
Sort:
by name
by year
Working paper
Piontkovski D. arxiv.org. math. Cornell University, 2014. No. arXiv:1412.8601.
We show that a direct limit of surjections of (weak) Golod--Shafarevich algebras is a weak Golod--Shafarevich algebra as well. This holds both for graded and for filtered algebras provided that the filtrations are induced by the filtration of the first entry of the sequence. It follows that the limit is an algebra of exponential growth. An example shows that the assumptions of this theorem cannot be directly weakened.
Added: Feb 2, 2015
Working paper
Liviu O., Verbitsky M. arxiv.org. math. Cornell University, 2010. No. 1002.3473.
We present an overview of recent results in locally conformally K¨ahler geometry, with focus on the topological properties which obstruct the existence of such structures on compact manifolds.
Added: Nov 2, 2012
Working paper
Gimpelson V. E., Lukyanova A. IZA Discussion Paper. IZA, 2009. No. 3941.
The paper starts with discussing institutional framework for public sector wage setting in Russia. Given that individual choice of the sector is endogenous to wages, the authors recommend alternative econometric techniques for the public-private wage gap estimation. Applying switching regression that allows correcting for non-random sector selection, the paper provides wage gap estimates for various demographic, occupational, and territorial population subgroups. As it is shown, there is significant cross-group variation in the wage gap. The paper concludes that to eliminate the negative gap wages in the public sector should be linked to the private sector wages at the regional level.
Added: May 14, 2013
Working paper
Poldnikov D. Law. LAW. Высшая школа экономики, 2013. No. 16/LAW/2013.
  The paper suggests several ways to rediscover the legacy of early modern and classical natural law of the 18th century in contemporary legal thought through the joint efforts of legal history and legal theory with particular reference to the domain of contract law. Additionally, the paper justifies the revival of the research in the domain of natural law in connection with legal argumentation.   
Added: May 2, 2013
Working paper
Rudenko D. Cornell University Library, 2014
Our main object of study is a 3−valent graph with a vector function on its edges. The function assignes to an edge a pair of 2−adic integer numbers and satisfies additional condition: the sum of its values on three edges, terminating in the same vertex, is equal to 0. For each vertex of the graph three vectors corresponding to these edges generate a lattice over the ring of 2−adic integers. In this paper we study the restrictions, imposed on these lattices by the combinatorics of the graph. As an application we obtain the following fact: a rational balanced polygon cannot be cut into an odd number of triangles of equal areas. First result of this type was obtained by Paul Monsky in 1970. He proved that a square cannot be cut into an odd number of triangles of equal areas. In 2000 Sherman Stein conjectured that the same holds for any balanced polygon. We prove this conjecture in the case, when coordinates of all vertices of the cut are rational numbers.
Added: Nov 15, 2014
Working paper
Hainsworth R., Karminsky A. M., Solodkov V. M. Financial Economics. FE. Высшая школа экономики, 2012. No. 01.
Investors are being encouraged after the global crisis to reduce their dependence on the largest credit rating agencies for risk assessments of companies and securities. Comparing risk assessments from different sources rapidly becomes non-trivial when more than three credit rating agencies are involved. We propose a method for comparing rating scales, and hence constructing correspondence diagrams and tables, thereby treating the rating scales used by different agencies as objects of study. Scales are compared by looking at sets of ratings assigned to similar entities (in this case banks) with the assumption that the risk being measured by each credit rating agency is the same for a given rated entity at a given point in time. Two ratings assigned by two credit rating agencies may differ for two reasons: the two agencies have different opinions about the relative positioning of the rated entity (e.g., issuer or security) with respect to the universe of other rated entities; both agencies position the rated entity with respect to the universe of other rated entities in the same way, but they use different symbols to represent this position. Type 1 differences should disappear when a large number of ratings are considered. The existence of type 2 differences will require a mapping from one rating scale to another. Studying international bank ratings for a five-year period shows that there are type 2 differences for the largest credit rating agencies. A mechanism for constructing mappings between scales could lead to more competition with new credit rating agencies.
Added: Aug 28, 2012
Working paper
Vladimir L. Popov. arxiv.org. math. Cornell University, 2014. No. 1409.6330.
A "rational" version of the strengthened form of the Commuting Derivation Conjecture, in which the assumption of commutativity is dropped, is proved. A systematic method of constructing in any dimension greater than 3 the examples answering in the negative a question by M. El Kahoui is developed.
Added: Sep 24, 2014
Working paper
Positselski L. arxiv.org. math. Cornell University, 2011. No. 1012.3735.
We propose a construction of a tensor exact category F_X^m of Artin-Tate motivic sheaves with finite coefficients Z/m over an algebraic variety X (over a field K of characteristic prime to m) in terms of etale sheaves of Z/m-modules over X. Among the objects of F_X^m, in addition to the Tate motives Z/m(j), there are the cohomological relative motives with compact support M_cc^m(Y/X) of varieties Y quasi-finite over X. Exact functors of inverse image with respect to morphisms of algebraic varieties and direct image with compact supports with respect to quasi-finite morphisms of varieties Y\to X act on the exact categories F_X^m. Assuming the existence of triangulated categories of motivic sheaves DM(X,Z/m) over algebraic varities X over K and a weak version of the "six operations" in these categories, we identify F_X^m with the exact subcategory in DM(X,Z/m) consisting of all the iterated extensions of the Tate twists M_cc^m(Y/X)(j) of the motives M_cc^m(Y/X). An isomorphism of the Z/m-modules Ext between the Tate motives Z/m(j) in the exact category F_X^m with the motivic cohomology modules predicted by the Beilinson-Lichtenbaum etale descent conjecture (recently proven by Voevodsky, Rost, et al.) holds for smooth varieties X over K if and only if the similar isomorphism holds for Artin-Tate motives over fields containing K. When K contains a primitive m-root of unity, the latter condition is equivalent to a certain Koszulity hypothesis, as it was shown in our previous paper.
Added: Feb 20, 2014
Working paper
Nenko A. (., Basov N. Working Papers of Centre for German and European Studies (CGES). ISSN 1860-5680. SPbSU, University of Bielefeld, Centre for German and European Studies (CGES), 2013. No. 8.
Artists are among the key knowledge-generating actors in the city space,  particularly when they join in collectives. Knowledge creation in artistic groups  goes in constant (re-)interpretation of the essence of art, discussions on the  themes and formats for artworks, continuous interaction during collective  creative processes and the presentation of artworks in the city space. This  study explores the opportunities for semantic network analysis to shed light on  the knowledge structures underlying the creative practices of artistic  communities. Combining a set of quantitative and qualitative techniques, we  study the case of the artistic community “La Escocesa” located in Barcelona,  Spain. To map semantic networks as relations between co-occurring concepts,  texts of semi-structured interviews with the artists are used.1  Interpretation of  the structures is given with regard to the qualitative data collected during a field  study, and links the knowledge structures revealed to the peculiar  characteristics of the creative processes in the community, such as positioning  and identification, format of creative practices, engagement of publics,  community localization in a co-habilitation space and the broader urban  context. 
Added: Oct 21, 2014
Working paper
Brown F., Levin A. math. arxive. Cornell University, 2013. No.  1110.6917 [.
Abstract. We study the de Rham fundamental group of the configuration sp ace of several  marked points on a complex elliptic curve, and define multiple elliptic polylogarithms. These are multivalued functions with unipotent monodromy, and are constructed by a general averaging proce dure. We show that all iterated integrals on this configuration space can be expressed in terms of these functions.
Added: Oct 4, 2013
Working paper
Fenogenova A., Kuzmenko E. Linguistics. WP BRP. НИУ ВШЭ, 2016
Learner corpora constitute an effective resource for specialists in fields of second language acquisition, foreign language teaching and corpus linguistics. They tend to get significant scholarly help from statistical tools of various kinds. However, for valuable usage of a corpus it should provide convenient and powerful tools for searching and manipulating data. In this paper we focus on searching tools, presented in \textit{Russian Error-Annotated Learner English Corpus (REALEC)}, report our attempts to improve the format of the searching tools in our corpora. We also provide evidences that database search is much more efficient than common text search and demonstrate that search functionality in corpora is of great importance for research efficiency and extensive facilities.
Added: Dec 14, 2016
Working paper
Shitov Y. arxiv.org. math. Cornell University, 2014. No. 1406.2601.
We construct a nontrivial identity which holds in the semigroup of tropical 3-by-3 matrices.
Added: Mar 14, 2015
Working paper
V. V. Lebedev. arxiv.org. math. Cornell University, 2016. No. 1603.04539.
It is well--known that certain properties of continuous functions on the circle $\mathbb T$, related to the Fourier expansion, can be improved by a change of variable, i.e., by a homeomorphism of the circle onto itself. One of the results in this area is the Jurkat--Waterman theorem on conjugate functions, which improves the classical Bohr--Pal theorem.  In the present work we provide a short and technically very simple proof of the Jurkat--Waterman theorem. Our approach yields a stronger result.
Added: Nov 10, 2016
Working paper
Kuznetsov A. G. arxiv.org. math. Cornell University, 2013
A counterexample to the Jordan-H\"older property for semiorthogonal decompositions of derived categories of smooth projective varieties was constructed by B\"ohning, Graf von Bothmer and Sosna. In this short note we present a simpler example by realizing Bondal's quiver in the derived category of a blowup of the projective space.
Added: Jul 1, 2013
Working paper
Prokhorov Y. math. arxive. Cornell University, 2016
The aim of this short note is to give a simple proof of the non-rationality of the double cover of the three-dimensional projective space branched over a sufficiently general quartic.
Added: May 16, 2016
Working paper
Shulgin A. G. Economics. EC. Высшая школа экономики, 2017. No. 170.
This paper constructs a theoretical general equilibrium model for exchange rate determination in a small open commodity exporting economy based on an imperfect capital market a la Gabaix-Maggiori and appropriate for estimation on high frequency data and could be used for the evaluation of sterilized intervention effectiveness. To find empirical confirmation of the theoretical setup validity I use Russian daily statistics to estimate the model and investigate the reaction of the Russian ruble-US dollar exchange rate to sterilized interventions in the form of foreign currency repo auctions conducted by the Bank of Russia in the period of 2014-2017. I also estimate a vector error correction model on the same dataset and use it as important empirical benchmark for the theoretical model. The empirical analysis revealed a temporary statistically significant effect of sterilized intervention on exchange rate level, which peaked eight working days after the auction day. The combination of theoretical and empirical approaches demonstrates the effectiveness of the portfolio and the ineffectiveness of signalling channels in the transmission mechanism of the sterilized intervention instrument in Russian case
Added: Oct 16, 2017
Working paper
Abankina T., Derkachev P., Filatova L. et al. Management. MAN. Высшая школа экономики, 2015. No. WP BRP 43/MAN/2015.
Accessibility is a key priority of public policy in the social sphere, a necessary condition to ensure equal opportunities and cultural participation. Analysis of the international practice reveals that the issue of accessibility has two aspects - objective and subjective. Regression models were used to conduct empirical analysis of the impact of economic factors on the museum attendance. The factor analysis of the data for the period of 2010-2012 conducted with the principle component method allowed to identify five factors. As a result, we estimated the impact of each factor on the museum attendance.
Added: Dec 3, 2015
Working paper
Ducomet B., Zlotnik A. A., Romanova A. V. arxiv.org. math. Cornell University, 2013. No. 1309.7280 .
An initial-boundary value problem for the $n$-dimensional ($n\geq 2$) time-dependent Schrödinger equation in a semi-infinite (or infinite) parallelepiped is considered. Starting from the Numerov-Crank-Nicolson finite-difference scheme, we first construct higher order scheme with splitting space averages having much better spectral properties for $n\geq 3$. Next we apply the Strang-type splitting with respect to the potential and, third, construct discrete transparent boundary conditions (TBC). For the resulting method, the uniqueness of solution and the unconditional uniform in time $L^2$-stability (in particular, $L^2$-conservativeness) are proved. Owing to the splitting, an effective direct algorithm using FFT (in the coordinate directions perpendicular to the leading axis of the parallelepiped) is applicable for general potential. Numerical results on the 2D tunnel effect for a P\"{o}schl-Teller-like potential-barrier and a rectangular potential-well are also included.
Added: Oct 1, 2013
Working paper
Siliverstov B., Smirnov S. V., Tsukhlo S. KOF Working Papers. KOF. KOF Swiss Economic Institute, 2012. No. 306.
This study investigates usefulness of business tendency surveys in industrial sector for out-of-sample prediction of growth of industrial production in Russia. A special attention is paid to performance of survey-augmented models during the recent Great Recession 2008/2009. Using the real-time data vintages of the index of industrial production in Russia we conclude that the use of surveys positively contributes to boosting forecast accuracy of industrial production compared with forecasts based on a benchmark univariate autoregressive model.
Added: Apr 12, 2013
Working paper
Pikalova A. G., Korobeynikova M. N. SEARCH Working Paper. WP4. Университет Барселоны, 2013. No. 27.
The European Neighbourhood Policy (ENP) remains the basis on which the EU works with its neighbours to achieve the closest possible political association and the greatest possible degree of economic integration. Knowledge creation precisely research and technological development (RTD) is a shaping basis of up-to-date economy and measures focused on responding to the global challenges. International RTD cooperation and transfer of knowledge is essential to reinforce research capacity of involved parties, to share respective resources and risks as well as to lay the foundation for joint innovative activities. EU RTD programmes are open for participation of scientists from any countries world-wide including the EECA countries and Russia in cooperation with the European researchers. The EU policy actively promotes integration of the EECA and Russian scientists into the European Research Area. The present paper offers assessment of EU-EECA and EU-Russia cooperation within FP5-7 (1998-2012) classified by country, by discipline and by type of organisation. The conducted assessment is based on the collection and systematisation of data on joint EU-EECA and EU-Russia projects extracted from the EU CORDIS Project database. The synergy with the FP7 IncoNet EECA and FP6 SCOPE-EAST projects has been used. The part on Russian participation in projects within FP7 includes data presented by the European Commission at the workshops. The Case-study of 5 functioning EU-EECA thematic research networks was carried out via a specially elaborated questionnaire addressed to EU and EECA partners of ongoing research projects under the 7th EU Framework RTD Programme. The Case-study contributed to analysis of the effects of EU-EECA thematic research networks, formed in the course of FP7 projects including identification of added value, success stories and barriers to EU-EECA collaboration. It helped to understand what barriers scientists face implementing joint research projects under EU Framework RTD Programme.
Added: Jul 31, 2014
Working paper
Kosareva N., Polidi T. D., Puzanov A. et al. Urban and Transportation Studies. WP BRP 03/URB/2016. HSE Working Papers, 2016
Russian cities currently feel the utmost need both for improving the affordability of housing and upgrading the quality and enhancing the beautification of the urban environment, developing public spaces, expanding the diversity of forms of housing tenure for different categories of citizen. Implementation of the housing policy objectives necessitates a considerable update of urban planning policy which is currently characterized by minimum urban planning regulations and inadequate enforcement of those in place. Urban development regulation and land use system remains a source of ‘administrative rent’ and appears to be unable to ensure a transparent legal framework for investors and developers, which is replaced by high administrative barriers. The paper reviews the current state of housing and urban planning policies in Russia, the practice of reconciling the goals, objectives and instruments of the foregoing policies. Housing and urban planning policies both at federal and local levels are described and case studies of inconsistencies in implementation of housing and urban planning policies in Russian cities are analyzed. The paper also sets forth the proposals on how to streamline housing and urban planning policies with a view to improving the affordability of housing and upgrading the quality of urban environment.
Added: Feb 19, 2016