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Search Results: 1 - 10 of 465 matches for " Romina Kasman "
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El proceso de consolidación del sistema de partidos en Argentina. Democratización y elecciones del 2007
Romina Kasman
Revista Enfoques : Ciencia Política y Administración Pública , 2007,
Abstract: This article analyzes the characteristics of the democratization process in contemporary Argentina, using the following variables: party system, working dynamics and the game rules in the political system and the presidential form of government, all of which determine the degree of institutionalization and instauration of the contemporary Argentinean democratic regime. For this the author uses two central axis of analysis: the State reform and the political reform. Finally, today’s politics with Néstor Kirchner are analyzed in relation with the development of substantial political system reforms which favors a greater democratization of the regime.
Efficiency, productivity and stock performance: Evidence from the Turkish banking sector
Kasman Saadet,Kasman Adnan
Panoeconomicus , 2011, DOI: 10.2298/pan1103355k
Abstract: This paper investigates the link between stock performance of the listed commercial banks in the Turkish stock exchange and three measures of bank performance, such as technical efficiency, scale efficiency and productivity for the period 1998-2008. The relationship between efficiency and stock returns is investigated by running a regression of stock returns on measures of performance and some bank specific variables. The results indicate that the changes in three measures of performance have positive and significant effect on stock returns, suggesting that stocks of technical efficient, scale efficient and productive banks tend to outperform their inefficient and unproductive rivals.
Bispectral KP Solutions and Linearization of Calogero-Moser Particle Systems
Alex Kasman
Physics , 1994, DOI: 10.1007/BF02099435
Abstract: A new construction using finite dimensional dual grassmannians is developed to study rational and soliton solutions of the KP hierarchy. In the rational case, properties of the tau function which are equivalent to bispectrality of the associated wave function are identified. In particular, it is shown that there exists a bound on the degree of all time variables in tau if and only if the wave function is rank one and bispectral. The action of the bispectral involution, beta, in the generic rational case is determined explicitly in terms of dual grassmannian parameters. Using the correspondence between rational solutions and particle systems, it is demonstrated that beta is a linearizing map of the Calogero-Moser particle system and is essentially the map sigma introduced by Airault, McKean and Moser in 1977.
Nested Bethe Ansatz and Finite Dimensional Canonical Commutation Relations
Alex Kasman
Physics , 2000,
Abstract: Recent interest in discrete, classical integrable systems has focused on their connection to quantum integrable systems via the Bethe equations. In this note, solutions to the rational nested Bethe ansatz (RNBA) equations are constructed using the ``completed Calogero-Moser phase space'' of matrices which satisfy a finite dimensional analogue of the canonical commutation relationship. A key feature is the fact that the RNBA equations are derived only from this commutation relationship and some elementary linear algebra. The solutions constructed in this way inherit continuous and discrete symmetries from the CM phase space.
Spectral Difference Equations Satisfied by KP Soliton Wavefunctions
Alex Kasman
Physics , 1998, DOI: 10.1088/0266-5611/14/6/008
Abstract: The Baker-Akhiezer (wave) functions corresponding to soliton solutions of the KP hierarchy are shown to satisfy eigenvalue equations for a commutative ring of translational operators in the spectral parameter. In the rational limit, these translational operators converge to the differential operators in the spectral parameter previously discussed as part of the theory of "bispectrality". Consequently, these translational operators can be seen as demonstrating a form of bispectrality for the non-rational solitons as well.
n-Schur Functions and Determinants on an Infinite Grassmannian
Alex Kasman
Physics , 1998,
Abstract: A set of functions is defined which is indexed by a positive integer $n$ and partitions of integers. The case $n=1$ reproduces the standard Schur polynomials. These functions are seen to arise naturally as a determinant of an action on the frame bundle of an infinite grassmannian. This fact is well known in the case of the Schur polynomials ($n=1$) and has been used to decompose the $\tau$-functions of the KP hierarchy as a sum. In the same way, the new functions introduced here ($n>1$) are used to expand quotients of $\tau$-functions as a sum with Plucker coordinates as coefficients.
Grassmannians, Nonlinear Wave Equations and Generalized Schur Functions
Alex Kasman
Physics , 1998,
Abstract: A set of functions is introduced which generalizes the famous Schur polynomials and their connection to Grasmannian manifolds. These functions are shown to provide a new method of constructing solutions to the KP hierarchy of nonlinear partial differential equations. Specifically, just as the Schur polynomials are used to expand tau-functions as a sum, it is shown that it is natural to expand a quotient of tau-functions in terms of these generalized Schur functions. The coefficients in this expansion are found to be constrained by the Pl\"ucker relations of a grassmannian.
Bispectrality of KP Solitons
Alex Kasman
Physics , 1998,
Abstract: It is by now well known that the wave functions of rational solutions to the KP hierarchy (those which can be achieved as limits of the pure n-soliton solutions) satisfy an additional eigenvalue equation for ordinary differential operators in the spectral parameter. This property is known as ``bispectrality'' and has proved to be both interesting and useful. In this note, it is shown that certain (non-rational) soliton solutions of the KP hierarchy satisfy an eigenvalue equation for a non-local operator constructed by composing ordinary differential operators in the spectral parameter with translation operators in the spectral parameter, and therefore have a form of bispectrality as well. Considering the results relating ordinary bispectrality to the self-duality of the rational Calogero-Moser particle system, it seems likely that this new form of bispectrality should be related to the duality of the Ruijsenaars system.
KP Solitons are Bispectral
Alex Kasman
Physics , 1998,
Abstract: It is by now well known that the wave functions of rational solutions to the KP hierarchy which can be achieved as limits of the pure $n$-soliton solutions satisfy an eigenvalue equation for ordinary differential operators in the spectral parameter. This property is known as ``bispectrality'' and has proved to be both interesting and useful. In a recent preprint (math-ph/9806001) evidence was presented to support the conjecture that all KP solitons (including their rational degenerations) are bispectral if one also allows translation operators in the spectral parameter. In this note, the conjecture is verified, and thus it is shown that all KP solitons have a form of bispectrality. The potential significance of this result to the duality of the classical Ruijsenaars and Sutherland particle systems is briefly discussed.
Bispectrality of $N$-Component KP Wave Functions: A Study in Non-Commutativity
Alex Kasman
Physics , 2015, DOI: 10.3842/SIGMA.2015.087
Abstract: A wave function of the $N$-component KP Hierarchy with continuous flows determined by an invertible matrix $H$ is constructed from the choice of an $MN$-dimensional space of finitely-supported vector distributions. This wave function is shown to be an eigenfunction for a ring of matrix differential operators in $x$ having eigenvalues that are matrix functions of the spectral parameter $z$. If the space of distributions is invariant under left multiplication by $H$, then a matrix coefficient differential-translation operator in $z$ is shown to share this eigenfunction and have an eigenvalue that is a matrix function of $x$. This paper not only generates new examples of bispectral operators, it also explores the consequences of non-commutativity for techniques and objects used in previous investigations.
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