128,077 research outputs found
Cyclical Mackey Glass Model for Oil Bull Seasonal
No full textIn this article, we propose an innovative way for modelling oil bull seasonals taking into account seasonal speculations in oil markets. Since oil prices behave very seasonally during two periods of the year (summer and winter), we propose a modification of Mackey Glass equation by taking into account the rhythm of seasonal frequencies. Using monthly data for WTI oil prices, Seasonal Cyclical Mackey Glass estimates indicate that seasonal interactions between heterogeneous speculators with different expectations may be responsible for pronounced swings in prices in both periods. Moreover, the seasonal frequency / 3(referring to a period of 6 months) appears to be persistent over time.Oil bull seasonal, Seasonal speculations, Heterogeneous agents model, Seasonal Cyclical Mackey Glass models.
B. Frank Mackey Caricature
No full textB. Frank Mackey is smoking a cigar and standing in front of a field and two workers carrying baskets of cotton on their heads. Autograph on recto: "B. Frank Mackey."B. Frank Mackey was a lawyer and a member of the Little Rock School Board from 1959-1962
Seniors Behind the Wheel
No full textAnd off the road before they cause an accidentFall 2012Accompanied by video fil
Mackey compactness in B(S)
No full textURL des Documents de travail : https://centredeconomiesorbonne.cnrs.fr/publications/Documents de travail du Centre d'Economie de la Sorbonne 2021.30 - ISSN : 1955-611XLet S be a set equipped with the discrete topology and B(S) be the normed space of bounded real mappings on S, endowed with the sup-norm. In this paper, we first prove that B(S) is the nom dual of the space rca(S) of all regular and bounded Borel measure on S. Then we show that the closed unit ball of B(S) is compact in the Mackey topology τ (B(S), rca(S)). We also provide a short presentation of an economic application for an intertemporal allocation of resources.S est un ensemble équipé avec la topologie discrète et B(S) est l'espace normé des fonctions bornées sur S mini de la norme sup. Dans ce papier, nous démontrons tout d'abord B(S) est le dual pour la topologie de la norme de l'espace rca(S) des mesures de Borel régulières et bornées sur S. Ensuite, nous montrons que la boule unité fermée de B(S) est compacte pour la topologie de Mackey τ (B(S), rca(S)). Nous proposons aussi une courte présentation d'une application économique concernant l'allocation inter-temporelle de ressources
Mackey compactness in B(S)
No full textURL des Documents de travail : https://centredeconomiesorbonne.cnrs.fr/publications/Documents de travail du Centre d'Economie de la Sorbonne 2021.30 - ISSN : 1955-611XLet S be a set equipped with the discrete topology and B(S) be the normed space of bounded real mappings on S, endowed with the sup-norm. In this paper, we first prove that B(S) is the nom dual of the space rca(S) of all regular and bounded Borel measure on S. Then we show that the closed unit ball of B(S) is compact in the Mackey topology τ (B(S), rca(S)). We also provide a short presentation of an economic application for an intertemporal allocation of resources.S est un ensemble équipé avec la topologie discrète et B(S) est l'espace normé des fonctions bornées sur S mini de la norme sup. Dans ce papier, nous démontrons tout d'abord B(S) est le dual pour la topologie de la norme de l'espace rca(S) des mesures de Borel régulières et bornées sur S. Ensuite, nous montrons que la boule unité fermée de B(S) est compacte pour la topologie de Mackey τ (B(S), rca(S)). Nous proposons aussi une courte présentation d'une application économique concernant l'allocation inter-temporelle de ressources
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Fused Mackey functors
No full textLet be a finite group. In [HTW], Hambleton, Taylor and Williams have considered the question of comparing Mackey functors for and biset functors defined on subgroups of and bifree bisets as morphisms. This paper proposes a different approach to this problem, from the point of view of various categories of -sets. In particular, the category of fused -sets is introduced, as well its category of spans. The fused Mackey functors for over a commutative ring are defined as -linear functors from this (-linearized) category of spans to -modules. They form an abelian subcategory of the category of Mackey functors for over , equivalent (for ) to the category to the category of conjugation Mackey functors of [HTW]. The category of fused Mackey functors is also equivalent to the category of modules over the fused Mackey algebra, which is a quotient of the usual Mackey algebra of over . Reference: [HTW] I. Hambleton, L. R. Taylor, and E. B. Williams. Mackey functors and bisets. Geom. Dedicata, 148:157--174, 2010
On Morita and derived equivalences for cohomological Mackey algebras
No full textBy results of the second author, a source algebra equivalence between two p-blocks of finite groups induces an equivalence between the categories of cohomological Mackey functors associated with these blocks, and a splendid derived equivalence between two blocks induces a derived equivalence between the corresponding categories ofcohomological Mackey functors. The main result of this paper proves a partial converse: an equivalence (resp. Rickard equivalence) between the categories of cohomological Mackey functors of two blocks of finite groups induces a permeable Morita (resp. derived) equivalence between the two block algebras
Fused Mackey functors
No full textLet be a finite group. In [HTW], Hambleton, Taylor and Williams have considered the question of comparing Mackey functors for and biset functors defined on subgroups of and bifree bisets as morphisms. This paper proposes a different approach to this problem, from the point of view of various categories of -sets. In particular, the category of fused -sets is introduced, as well its category of spans. The fused Mackey functors for over a commutative ring are defined as -linear functors from this (-linearized) category of spans to -modules. They form an abelian subcategory of the category of Mackey functors for over , equivalent (for ) to the category to the category of conjugation Mackey functors of [HTW]. The category of fused Mackey functors is also equivalent to the category of modules over the fused Mackey algebra, which is a quotient of the usual Mackey algebra of over . Reference: [HTW] I. Hambleton, L. R. Taylor, and E. B. Williams. Mackey functors and bisets. Geom. Dedicata, 148:157--174, 2010
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