Search results for " space"
showing 10 items of 4562 documents
La fine del paesaggio
2018
Nel Seicento la dimensione culturale della scoperta ha consentito di rappresentare la componente estetica del territorio italiano identificando nei passaggi obbligati dei viaggiatori del Grand Tour i luoghi delegati alla idealizzazione del suo paesaggio. Nella condizione contemporanea si mostra urgente una nuova rivelazione connessa al riconoscimento dell’attuale componente morfologica disposta dalla grande trasformazione del territorio operata nella seconda metà del Novecento. L’estinzione delle grandi urgenze della città moderna, i temi connessi alla limitatezza delle risorse, la dimensione ecologica, esautorando le proiezioni urbanistiche a lungo termine, hanno incluso le indagini sul te…
Storie di uomini, racconti di spazio
2019
Ancora oggi si susseguono notizie di uomini che strenuamente attraversano il Mediterraneo, di naufragi disperati che si susseguono con cadenza inesorabile, come in un appuntamento macabro con la morte, come in una triste litania funebre che si snoda sotto lo sguardo attonito dell’Occidente. Intanto un nuovo mondo sta silenziosamente nascendo, configurando con apparente disordine un nuovo assetto geopolitico, tra l’esaltazione nazionalistica di muri che riaffermano l’invalicabilità dei confini e un’accoglienza diffusa che invece ne invoca la disintegrazione mostrando la forza inarrestabile e pervicace della solidarietà tra gli uomini, una residua speranza nel futuro. Una sorta di ricomposizi…
Cardinal invariants of cellular Lindelof spaces
2018
A space X is said to be cellular-Lindelof if for every cellular family $$\mathcal {U}$$ there is a Lindelof subspace L of X which meets every element of $$\mathcal {U}$$ . Cellular-Lindelof spaces generalize both Lindelof spaces and spaces with the countable chain condition. Solving questions of Xuan and Song, we prove that every cellular-Lindelof monotonically normal space is Lindelof and that every cellular-Lindelof space with a regular $$G_\delta $$ -diagonal has cardinality at most $$2^\mathfrak {c}$$ . We also prove that every normal cellular-Lindelof first-countable space has cardinality at most continuum under $$2^{<\mathfrak {c}}=\mathfrak {c}$$ and that every normal cellular-Lindel…
Amor odit inertes (Ars 2, 229): Mobilità didascalica e staticità elegiaca
2005
Un'analisi della precettistica contenuta in Ars 2, 223-250 sulla 'dinamicità' dell'innamorato, letta come voluto rovesciamento, dall'interno, delle categorie spaziali elegiache The precepts of Ars 2, 223-250 on the lover's 'dynamic' attitude are read as a conscious reversal, from within, of the elegiac spatial cathegories.
Topological Dual Systems for Spaces of Vector Measure p-Integrable Functions
2016
[EN] We show a Dvoretzky-Rogers type theorem for the adapted version of the q-summing operators to the topology of the convergence of the vector valued integrals on Banach function spaces. In the pursuit of this objective we prove that the mere summability of the identity map does not guarantee that the space has to be finite dimensional, contrary to the classical case. Some local compactness assumptions on the unit balls are required. Our results open the door to new convergence theorems and tools regarding summability of series of integrable functions and approximation in function spaces, since we may find infinite dimensional spaces in which convergence of the integrals, our vector value…
Stability of impulsive differential systems
2013
The asymptotic phase property and reduction principle for stability of a trivial solution is generalized to the case of the noninvertible impulsive differential equations in Banach spaces whose linear parts split into two parts and satisfy the condition of separation.
The Exponential Dichotomy under Discretization on General Approximation Scheme
2011
This paper is devoted to the numerical analysis of abstract parabolic problem 𝑢 ( 𝑡 ) = 𝐴 𝑢 ( 𝑡 ) ; 𝑢 ( 0 ) = 𝑢 0 , with hyperbolic generator 𝐴 . We are developing a general approach to establish a discrete dichotomy in a very general setting in case of discrete approximation in space and time. It is a well-known fact that the phase space in the neighborhood of the hyperbolic equilibrium can be split in a such way that the original initial value problem is reduced to initial value problems with exponential decaying solutions in opposite time direction. We use the theory of compact approximation principle and collectively condensing approximation to show that such a decomposition o…
Categorically algebraic topology versus universal topology
2013
This paper continues to develop the theory of categorically algebraic (catalg) topology, introduced as a common framework for the majority of the existing many-valued topological settings, to provide convenient means of interaction between different approaches. Motivated by the results of universal topology of H. Herrlich, we show that a concrete category is fibre-small and topological if and only if it is concretely isomorphic to a subcategory of a category of catalg topological structures, which is definable by topological co-axioms.
Topological systems and Artin glueing
2012
Abstract Using methods of categorical fuzzy topology, the paper shows a relation between topological systems of S. Vickers and Artin glueing of M. Artin. Inspired by the problem of interrelations between algebra and topology, we show the necessary and sufficient conditions for the category, obtained by Artin glueing along an adjoint functor, to be (co)algebraic and (co)monadic, incorporating the respective result of G. Wraith. As a result, we confirm the algebraic nature of the category of topological systems, showing that it is monadic.
Diverging Collectives: Artist-Run Spaces versus Warehouse Shows Comparative models of art production and cooperation among young British artists
2017
The paper addresses the case of artist-run spaces and warehouse shows in the United Kingdom between the 1980s and 1990s, a time when autonomous group shows and independent artist collectives sprawled particularly thanks to the engagement of a new generation of artists, among whom were found later celebrities such as Damien Hirst and Douglas Gordon. It will be argued that both artist-run spaces and warehouse shows were feasible solutions for young authors against art market barriers and economic crisis, although they held structural and organisational differences that would affect aesthetic outcomes and present art history with a shift in the model of the art collective.