Low-carbon hydrogen is a promising option for energy security and decarbonization. Cooperation is needed to ensure the widespread use of low-carbon energy. Cooperation among hydrogen supply chain (HSC) agents is essential to overcome the high costs, the lack of infrastructure that needs heavy...

Our research aims to reveal the key social, economic, and other factors behind the common fertility trends of the CEE countries compared to the rest of Europe over the past decades. A panel analysis was conducted to examine the main (social and economic) determinants of the total fertility rate...

We study the structure of isometries of the quadratic Wasserstein space W2(Sn, · )over the sphere endowed with the distance inherited from the norm of Rn+1. We prove that W2(Sn, · )is isometrically rigid, meaning that its isometry group is isomorphic to that of (Sn, · ). This is in striking...

Typically, the inefficiency term in stochastic frontier models is assumed to be positively skewed; however, efficiency scores are biased if this assumption is violated. This paper considers the case in which negative skewness is also allowed in the model. The paper discusses estimation of a...

We estimate the causal effect of exposure to math during high school on university major choice and performance, using a unique administrative dataset of 1,396 twins extracted from the entire student population enrolled between 2011 and 2021 at an Italian university. We apply a Twin Fixed Effect...

In many occupations, having mathematical skills is considered a necessary condition for workers to perform adequately. For the high proportion of low-skilled workers in Brazil, this condition may constitute a barrier to access better jobs and undermine their performance in the labor market. This...

The purpose of this study is to develop an empirical analysis of the influence of several variables in the average proficiency of Brazilian High School students in mathematics - measured by Saeb's results. We aim to investigate the contribution of OBMEP - measured by the prizes by school - and...

This study aims to determine the most important component of economic freedom and to rank the performance of countries using multiple criteria decision-making tools within the context of fuzzy set theory. To do so, we utilize a combination of fuzzy entropy weighting and fuzzy technique for order...

The purpose of this study is to develop an empirical analysis of the influence of several variables in the average proficiency of Brazilian High School students in mathematics - measured by Saeb's results. We aim to investigate the contribution of OBMEP - measured by the prizes by school - and...

In many occupations, having mathematical skills is considered a necessary condition for workers to perform adequately. For the high proportion of low-skilled workers in Brazil, this condition may constitute a barrier to access better jobs and undermine their performance in the labor market. This...

We estimate the causal effect of exposure to math during high school on university major choice and performance, using a unique administrative dataset of 1,396 twins extracted from the entire student population enrolled between 2011 and 2021 at an Italian university. We apply a Twin Fixed Effect...

Teachers' stereotypical assessments widen the gender gap in earnings and formal sector employment after high school graduation, with lasting positive effects for men and shorter-term negative effects for women. Exposure to these assessments throughout high school disproportionately affects...

In this paper, we propose new linearly convergent second-order methods for minimizing convex quartic polynomials. This framework is applied for designing optimization schemes, which can solve general convex problems satisfying a new condition of quartic regularity. It assumes positive...

Stochastic frontier models commonly assume positive skewness for the inefficiency term. However, when this assumption is violated, efficiency scores converge to unity. The potential endogeneity of model regressors introduces another empirical challenge, impeding the identification of causal...

Our purpose in this note is to investigate the order properties of positive operators from a locally convex space into its conjugate dual. We introduce a natural generalization of the Busch-Gudder strength function and we prove Kadison's anti-lattice theorem and Ando's result on the infimum of...

A statisztikában a normális eloszlásnak központi szerepe van. Kutatásunk az alábbi tizenegy normalitásteszt statisztikai erejét vizsgálja: Shapiro–Wilk- (SW-), Shapiro–Francia- (SF-), Filliben- (F-), Kolmogorov–Smirnov- (KS-), Anderson–Darling- (AD-), Kuiper- (K-), Cramér–von...

A társadalmi hálózatok elemzésének módszertanát egyre szélesebb körben alkalmazzák regionális kapcsolatok kialakulásának és fejlődésének modellezésére. Cikkünkben e módszertan, valamint a széleskörűen alkalmazott gravitációs modell segítségével megvizsgáljuk, hogy...

We revise Krein’s extension theory of semi-bounded Hermitian operators by reducing the problem to finding all positive and contractive extensions of the “resolvent operator” (I + T )−1 of T . Our treatment is somewhat simpler and more natural than Krein’s original method which was...

We study strong core and Pareto-optimal solutions for multiple partners matching problem under lexicographic preference domains from a computational point of view. The restriction to the two-sided case is called stable many-to-many matching problem and the general one-sided case is called stable...

By using a constant step-size, the convergence analysis of the gradient projection method on the sphere is presented for a closed spherically convex set. This algorithm is applied to discuss copositivity of operators with respect to cones. This approach can also be used to analyse solvability of...

Tanulmányunk a különböző társadalmi hátterű diákok általános iskolai teljesítményében megnyilvánuló különbségek és a szegregáció alakulását mutatja be a 2006 és 2019 közötti időszakban. Számításaink szerint az adott időszakban jelentős mértékben nőtt a...

It is shown that a lsc function is convex if and only if the minimal set of any linear perturbation of the function is convex. That fact also yields that the convexity of a function is equivalent to the quasiconvexity of its all linear perturbations.

In nonperturbative formulation of quantum field theory, the vacuum state is characterized by the Wilsonian renormalization group (RG) flow of Feynman type field correlators. Such a flow is a parametric family of ultraviolet (UV) regularized field correlators, the parameter being the strength of...

In this paper, we introduce a general long-step algorithmic framework for solving linear programming problems based on the algebraically equivalent transformation technique proposed by Darvay. The main characteristics of the proposed general interior point algorithm are based on the long-step...

This paper investigates an important functional representation of the cone of bounded positive semidefinite operators. It is known that the representation by strength functions turns the Löwner order into the pointwise order. However, very little is known about the structure of strength...

We introduce a new two-sided stable matching problem that describes the summer internship matching practice of an Australian university. The model is a case between two models of Kamada and Kojima on matchings with distributional constraints. We study three solution concepts, the strong and weak...

The eigenvalue method, suggested by the developer of the extensively used Analytic Hierarchy Process meth- odology, exhibits right-left asymmetry: the priorities derived from the right eigenvector do not necessarily coincide with the priorities derived from the reciprocal left eigenvector. This...

Understanding the state space of observed Markov processes is essential for advancing causal inference in a wide range of scientific fields. This paper demonstrates how the previously unknown state space can be reconstructed by exploring the spectrum of the time-delay embedding matrix derived...

We present an interior-point algorithmic framework for P_* (κ)-Linear Complementarity Problems that is based on a barrier function which is defined by a new class of univariate kernel functions called Standard Kernel Functions (SKFs). A unified, comprehensive complexity analysis of the generic...

In this paper, we revisit the main principles for constructing polynomial-time primal-dual interior-point algorithms (IPAs). Starting from the break-through paper by Gonzaga (1989), their development was related to the barrier methods, where the objective function was added to the barrier for...

We generalize the results of Kuwae–Shioya and Bačák on Mosco convergence established for CAT(0)-spaces to the CAT(1)-setting, so that Mosco convergence implies convergence of resolvents which in turn imply convergence of gradient flows for lower-semicontinuous semi-convex functions. Our...

Sturm’s strong law of large numbers in CAT(0) spaces and in the Thompson metric space of positive invertible operators is not only an important theoretical generalization of the classical strong law but also serves as a root-finding algorithm in the spirit of a proximal point method with...

In recent decades, financialization has emerged as a significant phenomenon shaping global economies. It refers to the increasing role of financial markets, institutions, and practices in the overall functioning of economies, often at the expense of the real economy. The purpose of the study is...

A viselkedési pénzügyek szerint a befektetőket az érzelmeik is befolyásolják, nem racionálisan döntenek, ezzel magyarázatot szolgáltatva a tőzsdei anomália jelenségére. A tanulmányban a naptárhatás és az időjárás hatásának a meglétét vizsgáltuk 1991 és 2022 között a...

We describe surjective linear isometries and linear isometry groups of a large class of Lipschitz‐free spaces that includes, for example, Lipschitz‐free spaces over any graph. We define the notion of a Lipschitz‐free rigid metric space whose Lipschitz‐free space only admits surjective...

Quantum Wasserstein divergences are modified versions of quantum Wasserstein distances defined by channels, and they are conjectured to be genuine metrics on quantum state spaces by De Palma and Trevisan. We prove triangle inequality for quantum Wasserstein divergences for every quantum system...

In this paper, we suggest a new interior-point method for linear optimization, based on the idea of Parabolic Target Space. Our method can start at any strictly feasible primal-dual pair and go directly towards a solution by a predictor-corrector scheme. Each iteration needs inversion of a...

Benoît Mandelbrot (1924–2010) születésének 100. évfordulóján felidézzük néhány személyes találkozásunkhoz kötődő emlékeinket. A „fraktálok atyja” a munkásságán keresztül megismert csodás természeti objektumokhoz hasonlóan igen komplex személyiség volt. Nagy...

Tanulmányunkban az utóbbi években számos területen nagy sikerrel alkalmazott visszacsatolt neurális hálózatokat használjuk fel Csehország, Lengyelország, Magyarország és Szlovákia 1970 és 2019 közötti, 18 és 99 év közötti korokhoz tartozó életkorfüggő halandósági...

In this paper, we report data drawn from a field study in an Italian region (Campania), where a disastrous earthquake took place in 1980. We rely on subjects’ responses to a questionnaire and on experimental measures. We compare the time preferences in two different samples, the first one...

A szavazási eljárások távolságminimalizálási problémák megoldásaiként is levezethetők. A MedRank algoritmus meglehetősen erős feltételek mellett minimalizálja a Spearman-féle colstok távolságot. Rávilágítunk ennek az eredménynek a korlátaira, és megvizsgáljuk a MedRank...