Search results for " classe"
showing 10 items of 166 documents
Quadratic characters in groups of odd order
2009
Abstract We prove that in a finite group of odd order, the number of irreducible quadratic characters is the number of quadratic conjugacy classes.
Powers of conjugacy classes in a finite groups
2020
[EN] The aim of this paper is to show how the number of conjugacy classes appearing in the product of classes affect the structure of a finite group. The aim of this paper was to show several results about solvability concerning the case in which the power of a conjugacy class is a union of one or two conjugacy classes. Moreover, we show that the above conditions can be determined through the character table of the group.
Gaetano Mosca
2010
Biografia di Gaetano Mosca, descrizione e interpretazione del suo pensiero politico e sociologico, con particolare riferimento al concetto di classe politica
A chaque classe ses élèves : procédures et critères d'affectation à l'école élémentaire
2005
This paper examines the class formation procedures used in French elementary schools, specially when combination classes (with two grade levels) occur. Principals were interviewed about pupils' assignment criteria and at the same time, the class distributional properties of 70 classes were analysed. The results confirm that pupils are sorted into classrooms based on a combination of individual criteria, including gender and academic achievement, in an effort to keep to the initial mix of children. Moreover, principal and teachers assign more independent students to combination classes to ease the burden they place on teachers. These purposeful assignment procedures, which integrate academic…
Il gruppo di formazione
2018
La formazione nel lavoro di gruppo
Universal formulas for characteristic classes on the Hilbert schemes of points on surfaces
2007
This article can be seen as a sequel to the first author's article ``Chern classes of the tangent bundle on the Hilbert scheme of points on the affine plane'', where he calculates the total Chern class of the Hilbert schemes of points on the affine plane by proving a result on the existence of certain universal formulas expressing characteristic classes on the Hilbert schemes in term of Nakajima's creation operators. The purpose of this work is (at least) two-fold. First of all, we clarify the notion of ``universality'' of certain formulas about the cohomology of the Hilbert schemes by defining a universal algebra of creation operators. This helps us to reformulate and extend a lot of the f…
The Bua Group noun class system: Looking for a historical interpretation
2020
International audience; The way Bua languages express number on nouns mostly consists ofalternating suffi xes that bear witness of a former classifi cation system. However,Kulaal is the only present-day language where these markers are not frozen butactually trigger agreement with free, optional determiners that follow the noun andmay show some formal affi nity with its suffi x. For several reasons, previous attemptsat reconstructing a historical noun morphology common to all Bua languagesconsidered the sole suffi xes and neglected the determiners present in Kulaal. But,as is argued in the present paper, more recent data show that, in some cases, presentdaysuffi xes may result from the asso…
Poder local y evolución social en el País Valenciano del siglo XIX
2019
This paper offers the achievements and lacks of the studies on local power in the ancient Kingdom of Valencia during the XIXth century. The breakdown of the Ancien Regime by the liberal revolution is the point of departure. The process of social change started whith the revolution continued ever after the failure of the democratic experience thet begun at 1868. To discuss these topics (not always shared by spanish historians), it would be proposed the analysis of local cases during long-termed periods and a social approach to politics, specially referred to attitudes and action of lower social groups.
Carlo Ginzburg. Cuando el historiador amoneda un símbolo
2020
Resumen En este artículo pretendemos analizar la trayectoria, la contribución, los resultados y la influencia de un historiador de renombre mundial, Carlo Ginzburg. La suya es una investigación de largo recorrido, cuya influencia se ha dado no sólo en esta rama del saber, sino también en muy distintos ámbitos de las humanidades, de las ciencias, de las artes. Carlo Ginzburg ha sido reconocido e identificado principalmente a partir de dos logros historiográficos: la microhistoria y El queso y los gusanos. Por un lado, se le ve como el máximo representante de la microhistoria, la corriente de origen italiano que se expande principalmente en los años ochenta del siglo XX. Por otro lado, a este…
Some families of big and stable bundles on $K3$ surfaces and on their Hilbert schemes of points
2021
Here we investigate meaningful families of vector bundles on a very general polarized $K3$ surface $(X,H)$ and on the corresponding Hyper--Kaehler variety given by the Hilbert scheme of points $X^{[k]}:= {\rm Hilb}^k(X)$, for any integer $k \geqslant 2$. In particular, we prove results concerning bigness and stability of such bundles. First, we give conditions on integers $n$ such that the twist of the tangent bundle of $X$ by the line bundle $nH$ is big and stable on~$X$; we then prove a similar result for a natural twist of the tangent bundle of $X^{[k]}$. Next, we prove global generation, bigness and stability results for tautological bundles on $X^{[k]}$ arising either from line bundles…