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ORBi

Upside down with the strong partial clones Schölzel, Karsten E-print/Working paper (2013) Detailed reference viewed: 45 (5 UL)From tax evasion to tax planning Bourgain, Arnaud ; Pieretti, Patrice ; Zanaj, Skerdilajda E-print/Working paper (2013) This paper analyzes within a simple model how a removal of bank secrecy can impact tax revenues and banks'profitability, assuming that offshore centers are able to offer sophisticated but legal, tax ... [more ▼] This paper analyzes within a simple model how a removal of bank secrecy can impact tax revenues and banks'profitability, assuming that offshore centers are able to offer sophisticated but legal, tax planning. Two alternative regimes are considered. A first, in which there is strict bank secrecy and a second, where there is international information exchange for tax purposes. In particular, we show that sharing tax information with onshore countries can be a dominant strategy for an OFC if there is enough scope for providing tax planning. Moreover, a partial reduction of tax liabilities can already prompt OFCs to voluntarily exchange relevant tax information. We also discuss the conditions under which the possible removal of bank secrecy may reduce or increase the onshore country's tax revenue. [less ▲] Detailed reference viewed: 321 (111 UL)Macroeconomic Foundations of Financial Predictability Mehra, Rajnish ; E-print/Working paper (2013) Detailed reference viewed: 149 (9 UL)Euro at Risk: The Impact of Member Countries Credit Risk on the Stability of the Common Currency Bekkour, Lamia ; Jin, Xisong ; Lehnert, Thorsten et al E-print/Working paper (2012) Detailed reference viewed: 162 (15 UL)Fiber bundles and connections Poncin, Norbert E-print/Working paper (2012) Detailed reference viewed: 200 (24 UL)Limited Liability, Moral Hazard and Risk Taking – A Safety Net Game Neugebauer, Tibor ; E-print/Working paper (2012) Detailed reference viewed: 46 (2 UL)Excludability and Contribution: A Laboratory Study in Team Production Neugebauer, Tibor ; ; E-print/Working paper (2012) Detailed reference viewed: 98 (3 UL)The 2007‐2009 Financial Crisis: Changing Market Dynamics and the Impact of Credit Supply and Aggregate Demand Sensitivity* Grammatikos, Theoharry ; Vermeulen, Robert John Gerard E-print/Working paper (2012) Detailed reference viewed: 139 (0 UL)Noise Trading and the Cross-Section of Index Option Prices Irek, Fabian ; ; Lehnert, Thorsten et al E-print/Working paper (2012) Detailed reference viewed: 40 (1 UL)Sentiment Trades and Option Prices Lehnert, Thorsten ; ; E-print/Working paper (2012) Detailed reference viewed: 24 (0 UL)Lectures on Supergeometry Covolo, Tiffany ; Poncin, Norbert E-print/Working paper (2012) Detailed reference viewed: 552 (167 UL)Measuring the Bid-Ask Spreads: A Note on the Potential Downward Bias of the Thompson-Waller Estimator Otsubo, Yoichi E-print/Working paper (2012) Detailed reference viewed: 96 (3 UL)The Governance of Perpetual Financial Intermediaries Van Bommel, Jos ; E-print/Working paper (2012) Detailed reference viewed: 109 (4 UL)Vertically Splitting a Firm:Promotion and Demotion in a Team Production Experiment Neugebauer, Tibor ; ; et al E-print/Working paper (2012) Detailed reference viewed: 34 (1 UL)Modeling default correlation in a US retail loan portfolio Pisa, Magdalena ; Wolff, Christian ; E-print/Working paper (2012) Detailed reference viewed: 94 (1 UL)Market Perceptions of US and European Policy Actions Around the Subprime Crisis Grammatikos, Theoharry ; Lehnert, Thorsten ; Otsubo, Yoichi E-print/Working paper (2012) Detailed reference viewed: 129 (4 UL)Does the GARCH Structural Credit Risk Model Make a Difference? Jin, Xisong ; Lehnert, Thorsten E-print/Working paper (2011) In this study, we empirically investigate and evaluate various approaches to structurally assess credit risk using a panel of European banking groups. We consider not only the standard approaches in the ... [more ▼] In this study, we empirically investigate and evaluate various approaches to structurally assess credit risk using a panel of European banking groups. We consider not only the standard approaches in the literature, but also include models that allow the asset volatility to be stochastic and models that allow for short- and long-term components of default risk. Models are evaluated by comparing their ability to correctly and timely identify changes in risk indicators. Surprisingly, we find that the GARCH structural credit risk model, despite its more sophisticated modeling approach, typically underperforms more basic models. Importantly for macro-prudential policy, the combined Merton/GARCH-MIDAS model performs best and reflects important market events earlier than the other approaches. [less ▲] Detailed reference viewed: 156 (3 UL)Financial Intermediation in an Overlapping Generations Model with Transaction Costs Van Bommel, Jos ; ; E-print/Working paper (2011) Detailed reference viewed: 129 (2 UL)Large Portfolio Risk Management and Optimal Portfolio Allocation with Dynamic Copulas Jin, Xisong ; Lehnert, Thorsten E-print/Working paper (2011) Detailed reference viewed: 95 (2 UL)Corporate Governance and Financial Development: A Study of the French Case Guigou, Jean-Daniel ; ; et al E-print/Working paper (2011) Detailed reference viewed: 97 (2 UL)Using Monte Carlo to Price Continuously Monitored Barrier Options on Discontinuously Traded Underlyings Van Bommel, Jos E-print/Working paper (2011) Detailed reference viewed: 72 (2 UL)The Relative Informational Efficiency of Stocks, Options and Credit Default Swaps Bekkour, Lamia ; Lehnert, Thorsten ; E-print/Working paper (2011) Detailed reference viewed: 87 (2 UL)Transparency and Ending Times of Call Auctions: A Comparison of Euronext and Xetra Van Bommel, Jos ; E-print/Working paper (2011) Detailed reference viewed: 66 (1 UL)Strategic Delegation and Collusion: Do Incentive Schemes Matter? Guigou, Jean-Daniel ; ; E-print/Working paper (2011) Detailed reference viewed: 35 (0 UL)Public Good and Private Good Valuation for Waiting, Time Reduction: A Laboratory Study Neugebauer, Tibor ; E-print/Working paper (2011) Detailed reference viewed: 88 (2 UL)Cultural Values, CEO Risk Aversion and Corporate Takeovers Lehnert, Thorsten ; ; et al E-print/Working paper (2011) Detailed reference viewed: 101 (2 UL)The Relative Informational Efficiency of Stocks, Options and Credit Default Swaps Bekkour, Lamia ; Lehnert, Thorsten ; E-print/Working paper (2011) Detailed reference viewed: 91 (1 UL)Lectures on Algebraic Operads ; Poncin, Norbert E-print/Working paper (2011) Detailed reference viewed: 202 (21 UL)Luxemburger Auswanderer und ihre Nachfahren in den USA Eine Sekundärauswertung der American Community Survey Fehlen, Fernand E-print/Working paper (2010) Detailed reference viewed: 121 (8 UL)Moral Impossibility in the Petersburg Paradox : A Literature Survey and Experimental Evidence Neugebauer, Tibor E-print/Working paper (2010) Detailed reference viewed: 110 (9 UL)Contingent Capital: The Case for COERCs Wolff, Christian ; Vermaelen, Theo ; E-print/Working paper (2010) Detailed reference viewed: 34 (0 UL)Transmission of the Financial and Sovereign Debt Crises to the EMU: Stock Prices, CDS Spreads and Exchange Rates Grammatikos, Theoharry ; Vermeulen, Robert John Gerard E-print/Working paper (2010) Detailed reference viewed: 101 (2 UL)Modeling structural changes in the volatility process Lehnert, Thorsten ; ; E-print/Working paper (2010) Detailed reference viewed: 78 (1 UL)Limited Liability, Moral Hazard and Risk Taking - A Safety Net Game Experiment Neugebauer, Tibor ; E-print/Working paper (2010) Detailed reference viewed: 105 (4 UL)Georges-Louis Leclerc de Buffon’s ‘Essays on Moral Arithmetic Neugebauer, Tibor ; ; E-print/Working paper (2010) Detailed reference viewed: 183 (1 UL)Who makes the pie bigger? An experimental study on co-opetition Neugebauer, Tibor ; ; E-print/Working paper (2010) Detailed reference viewed: 112 (2 UL)Théorie des représentations du groupe symétrique ; Poncin, Norbert E-print/Working paper (2009) Detailed reference viewed: 78 (4 UL)Dispersion of Beliefs in the Foreign Exchange Market Wolff, Christian ; ; et al E-print/Working paper (2009) Detailed reference viewed: 23 (0 UL)Time-Variation in Term Permia: International Survey-Based Evidence Wolff, Christian ; ; E-print/Working paper (2009) Detailed reference viewed: 32 (0 UL)Behavioral Heterogeneity in the Option Market Lehnert, Thorsten ; ; E-print/Working paper (2009) Detailed reference viewed: 84 (0 UL)A Cumulative Prospect Theory Approach to Option Pricing Lehnert, Thorsten ; Wolff, Christian ; E-print/Working paper (2009) Detailed reference viewed: 172 (0 UL)Are Capital Controls in the Foreign Exchange Market Effective? Wolff, Christian ; ; E-print/Working paper (2008) Detailed reference viewed: 76 (0 UL)Law, corporate governance and financial system: Econometric analysis of French case Guigou, Jean-Daniel ; ; Blazy, Régis et al E-print/Working paper (2008) Detailed reference viewed: 47 (0 UL)Loss Functions in Option Valuation: A Framework for Selection Lehnert, Thorsten ; Wolff, Christian ; E-print/Working paper (2008) Detailed reference viewed: 93 (0 UL)An Experimental Analysis of Optimal Renewable Resource Management:The Fishery Neugebauer, Tibor ; ; E-print/Working paper (2008) Detailed reference viewed: 91 (1 UL)On maximal independent sets in circulant digraphs Bisdorff, Raymond E-print/Working paper (2007) In this research note we introduce St-Nicolas graphs, i.e. circulant digraphs showing exactly n maximal independent sets, isomorph under the digraph’s automorphisms group. This class of digraphs represent ... [more ▼] In this research note we introduce St-Nicolas graphs, i.e. circulant digraphs showing exactly n maximal independent sets, isomorph under the digraph’s automorphisms group. This class of digraphs represent a generalisation of Andrásfai graphs with interesting links to finite group theory. [less ▲] Detailed reference viewed: 34 (1 UL)Relative Performance Evaluation, Risk Aversion and Entry Guigou, Jean-Daniel ; ; Piaser, Gwenaël E-print/Working paper (2007) Detailed reference viewed: 33 (0 UL)Bid and price effects of increased competition in the first-price auction: experimental evidence Neugebauer, Tibor E-print/Working paper (2007) Detailed reference viewed: 52 (3 UL)Financial versus Social Efficiency of Corporate Bankruptcy Law: the French Dilemma ? Guigou, Jean-Daniel ; BLAZY, Régis ; et al E-print/Working paper (2007) Detailed reference viewed: 94 (0 UL)Evaluation des performances relatives, risque et entrée Guigou, Jean-Daniel ; E-print/Working paper (2006) Detailed reference viewed: 39 (0 UL)Impact de l’attrait des places bancaires sur les taux d’intérêt créditeurs : Un modèle de formation des taux créditeurs estimé sur données en panel de banques européennes Bourgain, Arnaud ; Pieretti, Patrice ; E-print/Working paper (2001) This article evaluates the impact of banking centers' attractiveness on deposit interest rates. Using balance-sheet data from a set of 135 banks, the authors test an intermediation model of deposit rate ... [more ▼] This article evaluates the impact of banking centers' attractiveness on deposit interest rates. Using balance-sheet data from a set of 135 banks, the authors test an intermediation model of deposit rate determination. In particular, the investigation shows a significant impact of « confidentiality » on deposit rates, thus confirming the importance of qualitative variables favouring local differentiation and clustering of banking activities. [less ▲] Detailed reference viewed: 87 (0 UL)Effets de complémentarité externes et incidence sur la productivité : le cas de l'industrie manufacturière luxembourgeoise Bourgain, Arnaud ; Pieretti, Patrice E-print/Working paper (2001) This article seeks to measure knowledge spillovers between nearby industries. This represents one of types of externality identified in the studies of industry location. A spillover indicator is suggested ... [more ▼] This article seeks to measure knowledge spillovers between nearby industries. This represents one of types of externality identified in the studies of industry location. A spillover indicator is suggested which can explain increasing returns at the aggregate level. It is shown that this indicator is positively related to industry diversity. As applied to data from Luxembourg’s manufacturing industry, this indicator suggests that labor productivity is increasing in industry diversity. [less ▲] Detailed reference viewed: 107 (0 UL)Hinweis auf das Projekt : Effizienz des Frühunterrichts: begleitende Forschung im Rahmen der Fremdsprachenreformen“, esquisse de l’orientation de la recherche conduite au sein du projet d’étude sur l’introduction de l’enseignement précoce du français dans les écoles primaires de la Sarre Ehrhart, Sabine ; E-print/Working paper (2001) Detailed reference viewed: 75 (2 UL)Analyse de l’évolution de la productivité totale des facteurs dans l’industrie luxembourgeoise Bourgain, Arnaud ; Pieretti, Patrice E-print/Working paper (1999) Detailed reference viewed: 68 (0 UL)On linear decompositions of L-valued simple graphs Bisdorff, Raymond E-print/Working paper (-) In this report we will present a linear decomposition of a given L- valued binary relation into a set of sub-relations of kernel-dimension one. We will apply this theoretical result to the design of a ... [more ▼] In this report we will present a linear decomposition of a given L- valued binary relation into a set of sub-relations of kernel-dimension one. We will apply this theoretical result to the design of a faster algorithm for computing L-valued kernels on general L-valued simple graphs. [less ▲] Detailed reference viewed: 29 (1 UL)Quel est l'intérêt d'une approche multi-dimensionnelle du jugement de préférence ? Bisdorff, Raymond E-print/Working paper (1995) We present, in terms of logic programming, an algorithm for constructing decision rules from an extensional representation of the solutions to a multiple attributes decision problem. The algorithm is ... [more ▼] We present, in terms of logic programming, an algorithm for constructing decision rules from an extensional representation of the solutions to a multiple attributes decision problem. The algorithm is based on the decision tree obtained from a hierarchical decomposition of the decision attributes along their discriminatory power of the decision acts. We illustrate our methodological approach with an application to the cognitive categorization of the human colour vision. [less ▲] Detailed reference viewed: 69 (3 UL)Le français langue seconde dans les écoles maternelles et primaires de la République de Vanuatu (Pacifique Sud), Bilan d’une année d’étude dans le cadre de la « bourse d‘excellence postdoctorale Aupelf-Uref » Ehrhart, Sabine E-print/Working paper (1995) Detailed reference viewed: 74 (2 UL)Quelques réflexions concernant la genèse du tayo en Nouvelle-Calédonie et discussion des éventuels apports venant de l’extérieur, notamment du créole réunionnais, Conférence donnée à l'Université de Münster, 1991 Ehrhart, Sabine E-print/Working paper (1994) Detailed reference viewed: 129 (0 UL)TikZ is more than meets the eyes Perucca, Antonella E-print/Working paper (n.d.) Detailed reference viewed: 22 (1 UL)The first-digit law Perucca, Antonella E-print/Working paper (n.d.) Detailed reference viewed: 71 (0 UL)On basis vectors of lattices Barthel, Jim Jean-Pierre ; Müller, Volker E-print/Working paper (n.d.) Integer lattices enjoy increasing interest among mathematicians and cryptographers. However, there are still many elementary open questions, like finding specific vectors or particular bases of a given ... [more ▼] Integer lattices enjoy increasing interest among mathematicians and cryptographers. However, there are still many elementary open questions, like finding specific vectors or particular bases of a given lattice. Our study consists in exhibiting which integer vectors may be chosen as basis vectors of a chosen lattice. The compelling part of our development is that this condition is obtained through an unusual application of Dirichlet's Theorem on primes in arithmetic progressions and that it has a surprising consequence for vectors achieving the successive minima. [less ▲] Detailed reference viewed: 44 (3 UL)A conjecture on primes in arithmetic progressions and geometric intervals Barthel, Jim Jean-Pierre ; Müller, Volker E-print/Working paper (n.d.) We conjecture that any interval of the form [q^t ,q^(t+1) ], where q≥ 2 and t≥1 denote positive integers, contains at least one prime from each coprime congruence class. We prove this conjecture first ... [more ▼] We conjecture that any interval of the form [q^t ,q^(t+1) ], where q≥ 2 and t≥1 denote positive integers, contains at least one prime from each coprime congruence class. We prove this conjecture first unconditionally for all 2≤q≤45000 and all t≥1 and second under ERH for almost all q≥2 and all t≥2. Furthermore, we outline heuristic arguments for the validity of the conjecture beyond the proven bounds and we compare it with related long-standing conjectures. Finally, we discuss some of its consequences. [less ▲] Detailed reference viewed: 48 (8 UL)Pascal triangle for kids Perucca, Antonella E-print/Working paper (n.d.) Detailed reference viewed: 31 (0 UL)Guess who is guessing? Perucca, Antonella E-print/Working paper (n.d.) Detailed reference viewed: 17 (2 UL)Mathematical hourglasses, just in time Perucca, Antonella E-print/Working paper (n.d.) Detailed reference viewed: 30 (0 UL)The least common multiple of several numbers in terms of greatest common divisors Perucca, Antonella E-print/Working paper (n.d.) Detailed reference viewed: 32 (1 UL)Beware proportions Perucca, Antonella ; Ronk, Pit Ferdy E-print/Working paper (n.d.) Detailed reference viewed: 36 (8 UL)Three-dimensional arithmetic billiards Perucca, Antonella ; Perissinotto, Flavio ; E-print/Working paper (n.d.) Detailed reference viewed: 132 (4 UL)New Constructions of Verifiable Delay Functions Barthel, Jim Jean-Pierre ; Rosie, Razvan E-print/Working paper (n.d.) Detailed reference viewed: 146 (10 UL)Rubik's Snakes: Learn and Play Perucca, Antonella E-print/Working paper (n.d.) Detailed reference viewed: 10 (2 UL)Four Riddles with Four Brothers Perucca, Antonella E-print/Working paper (n.d.) Detailed reference viewed: 54 (1 UL)Divisibility Graphs: Graphs representing modular multiplications Perucca, Antonella ; Seuré, Tim ; Wolff, Vincent E-print/Working paper (n.d.) Detailed reference viewed: 100 (11 UL)Linear smoothed extended finite element method ; ; et al E-print/Working paper (n.d.) The extended finite element method (XFEM) was introduced in 1999 to treat problems involving discontinuities with no or minimal remeshing through appropriate enrichment functions. This enables elements to ... [more ▼] The extended finite element method (XFEM) was introduced in 1999 to treat problems involving discontinuities with no or minimal remeshing through appropriate enrichment functions. This enables elements to be split by a discontinuity, strong or weak and hence requires the integration of discontinuous functions or functions with discontinuous derivatives over elementary volumes. Moreover, in the case of open surfaces and singularities, special, usually non-polynomial functions must also be integrated.A variety of approaches have been proposed to facilitate these special types of numerical integration, which have been shown to have a large impact on the accuracy and convergence of the numerical solution. The smoothed extended finite element method (SmXFEM) [1], for example, makes numerical integration elegant and simple by transforming volume integrals into surface integrals. However, it was reported in [1, 2] that the strain smoothing is inaccurate when non-polynomial functions are in the basis. This is due to the constant smoothing function used over the smoothing domains which destroys the effect of the singularity. In this paper, we investigate the benefits of a recently developed Linear smoothing procedure [3] which provides better approximation to higher order polynomial fields in the basis. Some benchmark problems in the context of linear elastic fracture mechanics (LEFM) are solved to compare the standard XFEM, the constant-smoothed XFEM (Sm-XFEM) and the linear-smoothed XFEM (LSm-XFEM). We observe that the convergence rates of all three methods are the same. The stress intensity factors (SIFs) computed through the proposed LSm-XFEM are however more accurate than that obtained through Sm-XFEM. To conclude, compared to the conventional XFEM, the same order of accuracy is achieved at a relatively low computational effort. [less ▲] Detailed reference viewed: 138 (3 UL)A Simple Inner-Product Functional Encryption Scheme from the Inverse-DDH Assumption Barthel, Jim Jean-Pierre ; Rosie, Razvan ; Sahu, Rajeev Anand E-print/Working paper (n.d.) Detailed reference viewed: 132 (29 UL)Divisibility conditions on the order of the reductions of algebraic numbers Sgobba, Pietro E-print/Working paper (n.d.) Let K be a number field, and let G be a finitely generated subgroup of K*. Without relying on (GRH) we prove an asymptotic formula for the number of primes \p of K such that the order of (G mod \p) is ... [more ▼] Let K be a number field, and let G be a finitely generated subgroup of K*. Without relying on (GRH) we prove an asymptotic formula for the number of primes \p of K such that the order of (G mod \p) is divisible by a fixed integer. We also provide a rational expression for the natural density of this set. Furthermore, we study the primes \p for which the order is k-free, and those for which the order has a prescribed \ell-adic valuation for finitely many primes \ell. An additional condition on the Frobenius conjugacy class of \p may be considered. In order to establish these results, we prove an unconditional version of the Chebotarev density theorem for Kummer extensions of number fields. [less ▲] Detailed reference viewed: 106 (13 UL)Unconscious assumptions in mathematical examples Perucca, Antonella E-print/Working paper (n.d.) Detailed reference viewed: 32 (6 UL)Calabi-Yau structures on (quasi)-bisymplectic algebras ; E-print/Working paper (n.d.) Detailed reference viewed: 15 (0 UL)Not participating in education, employment or training (NEET): Hope to mitigate new social risks in the UK? Murphy, Emily ; ; E-print/Working paper (n.d.) Young people not participating in education, employment or training (NEET) are a key policy concern in Europe. We examine whether hope, as a form of life course agency, plays a protective role against the ... [more ▼] Young people not participating in education, employment or training (NEET) are a key policy concern in Europe. We examine whether hope, as a form of life course agency, plays a protective role against the risk of being NEET in the context of the British welfare state. Hope is conceptualised as multidimensional: being a temporally embedded, agentic mentality comprised of one’s sense of adaptive decision-making in the present and pathways thinking towards the future. Longitudinal estimations based on the latest Understanding Society microdata (2009-2018) indicate a direct association between higher-hope modes, on average, and a lower likelihood of being NEET. Further, our study assesses whether hopeful agency is moderated by the experience of parental worklessness. Findings indicate that while hope is not more important for those who experienced disadvantages in upbringing, hopeful agency is shown to be equally important in the face of past and present NEET risks. For the UK, building young peoples’ adaptive, agentic mentality towards their future in education or employment over the long-term, may prove one cost-effective policy approach. [less ▲] Detailed reference viewed: 216 (51 UL)ON THE (NON-)EQUIVALENCE OF INTEGRAL BINARY QUADRATIC FORMS AND THEIR NEGATIVE FORMS Barthel, Jim Jean-Pierre ; Müller, Volker E-print/Working paper (n.d.) Integral binary quadratic forms have been extensively studied in order to compute the class number of real and complex quadratic ﬁelds. Many studies restricted the equivalence class of quadratic forms or ... [more ▼] Integral binary quadratic forms have been extensively studied in order to compute the class number of real and complex quadratic ﬁelds. Many studies restricted the equivalence class of quadratic forms or identiﬁed speciﬁc forms in order to compute the class number through enumeration of equivalence classes. One often used assumption is that a given form and its negative are equivalent or are synthetically identiﬁed. This document presents a concise Lagrangian approach to integral binary quadratic forms, outlines the equivalence classes in its broadest sense and uses it to develop a general condition when a given integral binary quadratic form and its negative are equivalent. Then, the existence of integral binary quadratic forms which are non-equivalent to their negatives is proven and an elementary algorithm to determine the (non-)equivalence of a given form and its negative is outlined. [less ▲] Detailed reference viewed: 91 (6 UL)Prime divisors of the l-Genocchi numbers and the ubiquity of Ramanujan-style congruences of level l ; Sgobba, Pietro E-print/Working paper (n.d.) Let \ell be any fixed prime number. We define the \ell-Genocchi numbers by G_n:=\ell(1-\ell^n)B_n, with B_n the n-th Bernoulli number. They are integers. We introduce and study a variant of Kummer's ... [more ▼] Let \ell be any fixed prime number. We define the \ell-Genocchi numbers by G_n:=\ell(1-\ell^n)B_n, with B_n the n-th Bernoulli number. They are integers. We introduce and study a variant of Kummer's notion of regularity of primes. We say that an odd prime p is \ell-Genocchi irregular if it divides at least one of the \ell-Genocchi numbers G_2,G_4,..., G_{p-3}, and \ell-regular otherwise. With the help of techniques used in the study of Artin's primitive root conjecture, we give asymptotic estimates for the number of \ell-Genocchi irregular primes in a prescribed arithmetic progression in case \ell is odd. The case \ell=2 was already dealt with by Hu, Kim, Moree and Sha (2019). Using similar methods we study the prime factors of (1-\ell^n)B_{2n}/2n and (1+\ell^n)B_{2n}/2n. This allows us to estimate the number of primes p\leq x for which there exist modulo p Ramanujan-style congruences between the Fourier coefficients of an Eisenstein series and some cusp form of prime level \ell. [less ▲] Detailed reference viewed: 55 (3 UL)Non-Fungible Tokens (NFTs): A Review of Pricing Determinants, Applications and Opportunities Kräussl, Roman ; Tugnetti, Alessandro E-print/Working paper (n.d.) This paper provides a review of the development of the non-fungible tokens (NFTs) market, with a particular focus on its pricing determinants, its current applications and future opportunities. We ... [more ▼] This paper provides a review of the development of the non-fungible tokens (NFTs) market, with a particular focus on its pricing determinants, its current applications and future opportunities. We investigate the current state of the NFT markets and highlight the perception and expectations of investors towards these products. We summarize and compare the financial and econometric models that have been used in the literature for the pricing of non-fungible tokens with a special focus on their predictive performance. Our intention is to design a framework that can help understanding the price formation of NFTs. We further aim to shed light on the value creating determinants of NFTs in order to better understand the investors’ behavior on the blockchain. [less ▲] Detailed reference viewed: 132 (24 UL)Kummer theory for finite fields and p-adic fields Perissinotto, Flavio ; Perucca, Antonella E-print/Working paper (n.d.) Let K be a finite field or a finite extension of Qp for some prime number p. If G is a finitely generated subgroup of K*, then we can consider the degree of the cyclotomic-Kummer extension K(\zeta_N ... [more ▼] Let K be a finite field or a finite extension of Qp for some prime number p. If G is a finitely generated subgroup of K*, then we can consider the degree of the cyclotomic-Kummer extension K(\zeta_N, \sqrt[n]{G})/K, where n divides N. If K is a finite field, then we give a closed formula for the degree, while if K is a p-adic field, then we describe a strategy to compute the degree. [less ▲] Detailed reference viewed: 66 (3 UL)Deniable Public-Key Authenticated Quantum Key Exchange van Wier, Jeroen ; Atashpendar, Arash ; Roenne, Peter E-print/Working paper (n.d.) In this work, we explore the notion of deniability in public-key authenticated quantum key exchange (QKE), which allows two parties to establish a shared secret key without leaving any evidence that would ... [more ▼] In this work, we explore the notion of deniability in public-key authenticated quantum key exchange (QKE), which allows two parties to establish a shared secret key without leaving any evidence that would bind a session to either party. The deniability property is expressed in terms of being able to simulate the transcripts of a protocol. The ability to deny a message or an action has applications ranging from secure messaging to secure e-voting and whistle-blowing. While quite well-established in classical cryptography, it remains largely unexplored in the quantum setting. Here, we first present a natural extension of classical definitions in the simulation paradigm to the setting of quantum computation and formalize the requirements for a deniable QKE scheme. We then prove that the BB84 variant of QKE, when authenticated using a strong designated verifier signature scheme, satisfies deniability and, finally, propose a concrete instantiation. [less ▲] Detailed reference viewed: 29 (4 UL)Weakening the tight coupling between geometry and simulation in isogeometric analysis: from sub- and super- geometric analysis to Geometry Independent Field approximaTion (GIFT) ; ; Tomar, Satyendra et al E-print/Working paper (n.d.) This paper presents an approach to generalize the concept of isogeometric analysis (IGA) by allowing different spaces for parameterization of the computational domain and for approximation of the solution ... [more ▼] This paper presents an approach to generalize the concept of isogeometric analysis (IGA) by allowing different spaces for parameterization of the computational domain and for approximation of the solution field. The method inherits the main advantage of isogeometric analysis, i.e. preserves the original, exact CAD geometry (for example, given by NURBS), but allows pairing it with an approximation space which is more suitable/flexible for analysis, for example, T-splines, LR-splines, (truncated) hierarchical B-splines, and PHT-splines. This generalization offers the advantage of adaptive local refinement without the need to re-parameterize the domain, and therefore without weakening the link with the CAD model. We demonstrate the use of the method with different choices of the geometry and field splines, and show that, despite the failure of the standard patch test, the optimum convergence rate is achieved for non-nested spaces. [less ▲] Detailed reference viewed: 284 (14 UL)A new one point quadrature rule over arbitrary star convex polygon/polyhedron ; ; et al E-print/Working paper (n.d.) The Linear Smoothing (LS) scheme \cite{francisa.ortiz-bernardin2017} ameliorates linear and quadratic approximations over convex polytopes by employing a three-point integration scheme. In this work, we ... [more ▼] The Linear Smoothing (LS) scheme \cite{francisa.ortiz-bernardin2017} ameliorates linear and quadratic approximations over convex polytopes by employing a three-point integration scheme. In this work, we propose a linearly consistent one point integration scheme which possesses the properties of the LS scheme with three integration points but requires one third of the integration computational time. The essence of the proposed technique is to approximate the strain by the smoothed nodal derivatives that are determined by the discrete form of the divergence theorem. This is done by the Taylor's expansion of the weak form which facilitates the evaluation of the smoothed nodal derivatives acting as stabilization terms. The smoothed nodal derivatives are evaluated only at the centroid of each integration cell. These integration cells are the simplex subcells (triangle/tetrahedron in two and three dimensions) obtained by subdividing the polytope. The salient feature of the proposed technique is that it requires only $n$ integrations for an $n-$ sided polytope as opposed to $3n$ in~\cite{francisa.ortiz-bernardin2017} and $13n$ integration points in the conventional approach. The convergence properties, the accuracy, and the efficacy of the LS with one point integration scheme are discussed by solving few benchmark problems in elastostatics. [less ▲] Detailed reference viewed: 71 (3 UL)Linear smoothed polygonal and polyhedral finite elements ; ; Bordas, Stéphane et al E-print/Working paper (n.d.) It was observed in [1, 2] that the strain smoothing technique over higher order elements and arbitrary polytopes yields less accurate solutions than other techniques such as the conventional polygonal ... [more ▼] It was observed in [1, 2] that the strain smoothing technique over higher order elements and arbitrary polytopes yields less accurate solutions than other techniques such as the conventional polygonal finite element method. In this work, we propose a linear strain smoothing scheme that improves the accuracy of linear and quadratic approximations over convex polytopes. The main idea is to subdivide the polytope into simplicial subcells and use a linear smoothing function in each subcell to compute the strain. This new strain is then used in the computation of the stiffness matrix. The convergence properties and accuracy of the proposed scheme are discussed by solving few benchmark problems. Numerical results show that the proposed linear strain smoothing scheme makes the approximation based on polytopes to deliver improved accuracy and pass the patch test to machine precision. [less ▲] Detailed reference viewed: 466 (10 UL)The Hardest Logic Puzzle Ever Perucca, Antonella E-print/Working paper (n.d.) Detailed reference viewed: 57 (1 UL)Kummer extensions of number fields (the case of rank 2) Perucca, Antonella E-print/Working paper (n.d.) Detailed reference viewed: 74 (18 UL) |
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