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Of all publications in the section: 3 714
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Working paper
Kudryashov Y. arxiv.org. math. Cornell University, 2012
In this article, we extend the phenomena of a bony attractor from a rather artificial class of step skew products to the class of diffeomorphisms on the Cartesian product of the two-dimensional torus by a sphere of arbitrary dimension.
Working paper
Lazareva O. Economics. EC. Высшая школа экономики, 2012. No. 21.

This paper estimates the effect of economic shocks that affect families with young children on children’s health, educational and behavioral outcomes in adolescence.  Transition period in Russia provides a natural experiment setting for estimating this effect.  During the economic turmoil of early transition many people lost their jobs, experienced salary declines or occupational downgrading. These individual labor market shocks were mainly caused by the structural changes in the economy. Analyzing household survey data from Russia I find that children who were under the age of five and whose parents were negatively affected during the early transition have poorer health in adolescence and are less likely to have completed high school. For the comparison group  –  children who were at the school age during the early transition  –  there is an effect on educational outcomes and risky behaviors but not on health. Absence of a father in a family during the early transition years has a negative health effect only for the younger age group. I also find differential effects for boys and girls, by mother and father.

Working paper
Shramov K., Prokhorov Y. math. arxive. Cornell University, 2019
We classify compact complex surfaces whose groups of bimeromorphic selfmaps have bounded finite subgroups. We also prove that the stabilizer of a point in the automorphism group of a compact complex surface of zero Kodaira dimension, as well as the stabilizer of a point in the automorphism group of an arbitrary compact Kaehler manifold of non-negative Kodaira dimension, always has bounded finite subgroups.
Working paper
Goncharuk N. B., Kudryashov Y. arxiv.org. math. Cornell University, 2015. No. 1504.03313.
In this article we prove in a new way that a generic polynomial vector field in ℂ² possesses countably many homologically independent limit cycles. The new proof needs no estimates on integrals, provides thinner exceptional set for quadratic vector fields, and provides limit cycles that stay in a bounded domain.
Working paper
Andreev N. A. Financial Economics. FE. Высшая школа экономики, 2017. No. WP BRP 59/FE/2017.
We study the boundedness properties of the value function for a general worst-case scenario stochastic dynamic programming problem. For the portfolio selection problem,we present sufficient economically reasonable conditions for the finitness and uniform boundedness of the value function. The results can be used to decide if the problem is ill-posed and to correctly solve the Bellman-Isaacs equation with an appropriate numeric scheme.
Working paper
Kurnosov N. arxiv.org. math. Cornell University, 2015
We prove that b2 is bounded for hyperk¨ahler manifolds with vanishing odd-Betti numbers. The explicit upper boundary is conjectured. Following the method described by Sawon we prove that b2 is bounded in dimension eight and ten in the case of vanishing odd-Betti numbers by 24 and 25 respectively.
Working paper
Ovchinnikov A., Pogudin G., Vo T. Working papers by Cornell University. Cornell University, 2018
Elimination of unknowns in systems of equations, starting with Gaussian elimination, is a problem of general interest. The problem of finding an a priori upper bound for the number of differentiations in elimination of unknowns in a system of differential-algebraic equations (DAEs) is an important challenge, going back to Ritt (1932). The first characterization of this via an asymptotic analysis is due to Grigoriev's result (1989) on quantifier elimination in differential fields, but the challenge still remained. In this paper, we present a new bound, which is a major improvement over the previously known results. We also present a new lower bound, which shows asymptotic tightness of our upper bound in low dimensions, which are frequently occurring in applications. Finally, we discuss applications of our results to designing new algorithms for elimination of unknowns in systems of DAEs.
Working paper
Przyjalkowski V., Shramov K. math. arxive. Cornell University, 2016
We prove that if a smooth variety with non-positive canonical class can be embedded into a weighted projective space of dimension~n as a well formed complete intersection and it is not an intersection with a linear cone therein, then the weights of the weighted projective space do not exceed n+1. Based on this bound we classify all smooth Fano complete intersections of dimensions 4 and 5, and compute their invariants.
Working paper
Penskoi A., Nadirashvili N. S., Berdnikov A. S. math. arxive. Cornell University, 2016
The known upper bounds for the multiplicities of the Laplace-Beltrami operator eigenvalues on the real projective plane are improved for the eigenvalues with even indexes. Upper bounds for Dirichlet, Neumann and Steklov eigenvalues on the real projective plane with holes are also provided.
Working paper
Feigin B. L., Miwa T., Jimbo M. et al. Cornell University Library, 2013. No. 1309.2147.
We construct an analog of the subalgebra $U\mathfrak{gl}(n)\otimes U\mathfrak{gl}(m)\subset U\mathfrak{gl}(m+n)$ in the setting of quantum toroidal algebras and study the restrictions of various representations to this subalgebra.
Working paper
Parshakov P., Байдина К. О. Economics/EC. WP BRP. Высшая школа экономики, 2017. No. WP BRP 163/EC/2017.
This study estimates an attendance demand model in a reduced form, with uncertainty as one of the determinants of demand, to test the Uncertainty of Outcome Hypothesis (UOH), using data from the Russian Football Premier League (RFPL). These data fit our requirements for two reasons. First, there are few sellout matches, so demand for tickets in the RFPL is not restricted by stadium capacity. Secondly, there have hitherto been no articles devoted to the study of outcome uncertainty in the RFPL. The results indicate that the UOH does not explain the behavioural pattern of attendees in the RFPL. The dependence between the attendance and uncertainty is found to be U-shaped or even declining. We explain the U-shaped dependence by the visiting team effect; an attendee’s utility in the RFPL depends more on seeing a top team coming to the city than on the uncertainty of the outcome of the match.
Working paper
Gasparetto T. M., Fernandez-Jardon Fernandez C. M., Barajas A. Management. MAN. Высшая школа экономики, 2014. No. Management WP BRP 30/MAN/2014.
The paper contributes to explain an unexplored competition that is the Brazilian State Championships. How it is organized and the financial features of three championships are described. The aim of the paper is to discover if the presence of "Brand-teams" in a competition increases the income of all participating teams and if the type of championship conditions the effect of Brand Team on revenues of all teams. As the present study aims to be a pioneer in economic research on Brazilian State Championships, it has an exploratory character. The study uses an equations system to estimate for testing the hypothesis. The estimation method is 3SLS to delete the possible endogeneity of the variables. There have been studied 400 matches played by 48 teams from Mineiro, Paulista and Carioca Championships in season 2013. The structure of the Brazilian State Championship, with the participation of brand-teams, creates an income redistribution effect. The features of the visiting team imply an increase in attendance. This effect is moderated by the type of Championship. The Championship structure generates an additional increase of the revenue. They increase according to the phase in which the competition develops. This paper contributes to introduce the Brazilian State Championships. Moreover, it comes to justify the participation of brand-teams in order to help smallest teams to increase their revenues. The paper shows that the organization of some Championships has more beneficial effects than others
Working paper
Guriev S., Vakulenko E. Centre for Economic Policy Research Discussion Paper Series. ISSN 0265-8003. Centre for Economic Policy Research, 2013. No. 9675.
In this paper, we study panel data on region-to-region gross migration flows in Russia for 1995-2010. We find that barriers to labor mobility that hindered internal migration in 1990s, have been generally eliminated by the end of 2000s. In 1990s many poor Russian regions were in a poverty trap: potential workers wanted to leave those regions but could not afford to finance the move. In 2000s (especially in late 2000s), these barriers were no longer binding. Overall economic growth and development of financial markets allowed even poorest Russian regions to grow out of the poverty traps. This resulted in convergence in Russian labor market in 2000s; the interregional gaps in incomes, wages and unemployment rates decreased substantially and are now comparable to those in Europe.
Working paper
Bartunov S., Кондрашкин Д. А., Osokin A. et al. Computation and language. arXiv:1502.07257. Arxiv.org, 2015
Recently proposed Skip-gram model is a powerful method for learning high-dimensional word representations that capture rich semantic relationships between words. However, Skip-gram as well as most prior work on learning word representations does not take into account word ambiguity and maintain only single representation per word. Although a number of Skip-gram modifications were proposed to overcome this limitation and learn multi-prototype word representations, they either require a known number of word meanings or learn them using greedy heuristic approaches. In this paper we propose the Adaptive Skip-gram model which is a nonparametric Bayesian extension of Skip-gram capable to automatically learn the required number of representations for all words at desired semantic resolution. We derive efficient online variational learning algorithm for the model and empirically demonstrate its efficiency on word-sense induction task.
Working paper
Suslov D. Basic research program. WP BRP. National Research University Higher School of Economics, 2014
Despite relative normalization of the US-Russia dialogue in early 2013 and their impressive cooperation on Syria and Iran later that year, the relations on the whole remain extremely fragile, volatile and at the same time stagnant. Their traditional agenda, based on arms control, is crumbling; leadership is both countries is not regarding positive US-Russian partnership as central for their vital national interests fulfillment; and the share of contradictions is growing. At best, this deprives the sides of many opportunities to advance their interests through cooperation. At worst, this could spark a new serious crisis by. The author argues that the fundamental problem of the US-Russia relations is their old-fashioned philosophy, centered on strategic deterrence and balancing. This philosophy, the paper claims, in its turn predetermines an agenda of the relations, which poorly reflects the real challenges that US and Russia face in the world of today and tomorrow. The author claims that the new philosophy of the US-Russia relations should be based not on strategic deterrence and strategic balance in a Cold war understanding, but on clear recognition that the sides need each other and need to cooperate in order to deal with real challenges and achieve real opportunities.
Working paper
Borisova E., Govorun A. V., Ivanov D. EIC working paper series. EIC. IMT School for Advanced Studies Lucca, 2016. No. 5/2016.
Does bridging or bonding social capital matter for redistribution preferences? Existing literature demonstrates causal link between measures of social capital and such preferences but does it mostly for developed countries with good enforcement of formal rules and without a distinction between two completely different types of social capital. We argue that welfare state relies on contributions from an immense number of anonymous citizens, thus attitudes towards strangers, i.e. generalized trust and solidarity should be salient. Using two surveys of about 34,000 and 37,000 Russians we prove this proposition showing the importance of the bridging type but not the bonding one. Instrumenting social capital with education, climate and distance from Moscow we deal with endogeneity concerns. Additionally we claim that connection between social capital and redistribution preferences for less developed countries such as Russia could be similar to developed countries.
Working paper
Kuwabara T. arxiv.org. math. Cornell University, 2013. No. 1311.1787.
We study algebras constructed by quantum Hamiltonian reduction associated with symplectic quotients of symplectic vector spaces, including deformed preprojective algebras, symplectic reflection algebras (rational Cherednik algebras), and quantization of hypertoric varieties introduced by Musson and Van den Bergh. We determine BRST cohomologies associated with these quantum Hamiltonian reductions. To compute these BRST cohomologies, we make use of method of deformation quantization (DQ-algebras) and F-action studied in [Kashiwara-Rouquier], and in [Gordon-Losev].
Working paper
Smirnov E. math. arxive. Cornell University, 2007
The classical Ehresmann-Bruhat order describes the possible degenerations of a pair of flags in a finite-dimensional vector space V; or, equivalently, the closure of an orbit of the group GL(V) acting on the direct product of two full flag varieties.  We obtain a similar result for triples consisting of two subspaces and a partial flag in V; this is equivalent to describing the closure of a GL(V)-orbit in the product of two Grassmannians and one flag variety. We give a rank criterion to check whether such a triple can be degenerated to another one, and we classify the minimal degenerations. Our methods involve only elementary linear algebra and combinatorics of graphs (originating in Auslander-Reiten quivers).
Working paper
Chernyavskiy A. EU Frontiers Policy Brief. ISSN 2498-7875. Center for European Neighborhood Studies, 2016. No. 12.
This paper looks into Russian economy growth rates versus the emerging and advanced economies and the world in general. It contains the analysis of key federal budget indicators dynamics in 2000−2016, as well as the draft 2017−2019 Federal Budget law. The paper highlights the challenges associated with the planned budget consolidation. In addition it reviews Russian corporate foreign debt dynamics or the period after imposing sanctions. The paper emphasizes that currently Russian corporations are successfully coping with external debt redemption and servicing.
Working paper
Khovanskaya I. A., Sonin K., Yudkevich M. M. CEFIR / NES Working Paper. Центр экономических и финансовых исследований и разработок в российской экономической школе, Российская экономическая школа, 2007. No. 112.
We study hiring decisions made by competing universities in a dynamic framework, focusing on the structure of university finance. Universities with annual state-approved financing underinvest in high-quality faculty, while universities that receive a significant part of their annual income from returns on endowments hire fewer but better faculty and provide long-term contracts. If university financing is linked to the number of students, there is additional pressure to hire low-quality short-term staff. An increase in the university’s budget might force the university to switch its priorities from ‘research’ to ‘teaching’ in equilibrium. We employ our model to discuss the necessity for state-financed endowments, and investigate the political economics of competition between universities, path-dependence in the development of the university system, and higher-education reform in emerging market economies.
Working paper
Rozhkov A. Changing Europe Summer School. Research Centre for East European Studies at the University of Bremen, 2012
Current paper brings into consideration the issue of building and developing customer relations in emerging Russian market. Usually multinational companies enter Russian market and try to apply here their business solutions developed in mature markets. Many researchers argue that emerging markets require customer education rather than customer orientation. We develop a complex model of customer orientation and relationship development and test it on the Russian subsidiaries of Finnish construction companies. Qualitative study based on in-depth interviews with middle- and top-managers suggests that processes of customer relations differ dramatically from those established in European market.