Search results for "Covering"
showing 10 items of 61 documents
Remarks about the Besicovitch Covering Property in Carnot groups of step 3 and higher
2016
International audience
Assouad dimension, Nagata dimension, and uniformly close metric tangents
2013
We study the Assouad dimension and the Nagata dimension of metric spaces. As a general result, we prove that the Nagata dimension of a metric space is always bounded from above by the Assouad dimension. Most of the paper is devoted to the study of when these metric dimensions of a metric space are locally given by the dimensions of its metric tangents. Having uniformly close tangents is not sufficient. What is needed in addition is either that the tangents have dimension with uniform constants independent from the point and the tangent, or that the tangents are unique. We will apply our results to equiregular subRiemannian manifolds and show that locally their Nagata dimension equals the to…
Riemann surfaces and Teichmüller theory
2017
Riemannin pinnat ja Teichmüller-teoriaa. Tämän työn päämääränä on määritellä Riemannin pintojen Teichmüller-avaruudet sekä tutkia niiden geometrisia ominaisuuksia. Ensin työssä kehitetään peiteavaruuksien ja toimintojen teoriaa, jota sovelletaan Möbius-kuvauksista koostuviin ryhmiin. Tämän jälkeen kvasikonformaalikuvaukset määritellään Riemannin pinnoille ja niiden yhteyttä yhdesti yhtenäisten Riemannin avaruuksien kvasikonformikuvauksiin tutkitaan. Näitä tietoja sekä yhdesti yhtenäisten Riemannin pintojen uniformisaatiolausetta hyödyntämällä todistetaan yleisten Riemannin pintojen uniformisaatiolause. Tämä tulos liittää pinnat Möbius-kuvauksien toimintoihin yhdesti yhtenäisillä Riemannin p…
Licenziamento e rideterminazione della sanzione disciplinare nel lavoro pubblico privatizzato
2020
Il contributo, dopo un’analisi della disciplina sanzionatoria del licenziamento invalido nel pubblico impiego, prende in esame il nuovo art. 63, c. 2 bis, del D.lgs. n. 165/2001. La norma, che attribuisce al giudice il potere di rideterminare la sanzione in caso di difetto di proporzionalità, è oggi una peculiarità della disciplina del lavoro pubblico privatizzato. L’Autore ritiene che questa si ponga in controtendenza con le recenti riforme del lavoro in Italia, in quanto recupera importanti spazi alla discrezionalità giudiziale.
Conjugately dense subgroups in generalized $FC$-groups
2009
MR 3219513 Reviewed Venkataramana T. N. Monodromy of cyclic coverings of the projective line. Invent. Math., 197 (2014), 1–-45. (Reviewer Francesca V…
2014
Let $d \geq 2$ and $n \geq 1$ be integers and $P_{n+1}$ be the pure braid group on $n + 1$ strands. In this paper, the author studies the image of $P_{n+1}$ under the monodromy action on the homology of a cyclic covering of degree $d$ of the projective line. More precisely, let $k_{1}, \ldots, k_{n + 1}$ be integers such that $1 \leq k_{i} \leq d - 1$ and gcd$(k_{i}, d) = 1$ for each $i$. Moreover, let $a_{1}, \ldots, a_{n + 1}$ be distinct points of the complex plane and $C$ be the space of points in $\mathbb{C}^{n + 1}$ with all distinct coordinates. Let us denote by $X_{a, k}$ the affine curve defined by the equation $$ y^{d} = (x - a_{1})^{k_{1}} (x - a_{2})^{k_{2}} \cdots (x - a_{n +1}…
Some remarks on universal covers and groups
2014
We give a quick reviw of problems concerning the topological behavior of contractible covering spaces, from the point of view of the topology at infinity.
La tutela assicurativa della responsabilità professionale
2010
The Authors conducted a fact-finding survey among the health operators in some Sicilian and calabrian hospitals, hèreby eitending it to include doctors in training - in light of D.Lgs. 368/99 - and heilth operatórs in the area o in consideration oflaw42|9.T\esurveywas'aimedatdeterminingthedegree ofawarenessofthetypeofinsurancecoveràgeand/orcontraclsandlnlicies(>, "claims made") signed by the respective services, as well as about the protection supplied to health operators by the same insurance contracts.
Homeomorphic graph manifolds: A contribution to the μ constant problem
1999
Abstract We give a characterization, in terms of homological data in covering spaces, of those maps between (3-dimensional) graph manifolds which are homotopic to homeomorphisms. As an application we give a condition on a cobordism between graph manifolds that guarantees that they are homeomorphic. This in turn is applied to give a partial result on the μ -constant problem in (complex) dimension three.
Is the Eco-label EU Decision for hard coverings really capable of capturing the environmental performances of the marble productive chain? A field ve…
2014
Purpose This work intends to show whether the Eco-label EU Decision for hard coverings, in which marble is contemplated among hard coverings as a natural product, is really capable of capturing the environmental performances of the marble productive chain, in other words whether it is actually viable for the natural products, like marble. Methods After a preliminary critical analysis of the suitability formarble of the current EU Decision (2009/607/EC), a classical life cycle assessment (LCA) methodology has been applied on the field to the marble “Perlato di Sicilia.” More specifically, the whole productive chain of a couple of firms treating the “Perlato di Sicilia” marble has been examin…