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The aim of this paper is to present a brief survey of some aspects of the theory of approximative retracts. We put special emphasis on properties of approximative absolute neighborhood retracts (both in the sense of Noguchi and in the sense of C[...]texto impreso
For a complex surface S , proper, smooth and connected, the authors find two bases of the spaces of rational homology H n (Hilb d S) Q of the Hilbert scheme of subschemes of S of length d . The idea of the proof of the main theorem is to prov[...]texto impreso
A Banach space E is said to have property A [property B] if E contains a copy isomorphic with l 1 [a complemented subspace isomorphic with l 1 ]. G. Pisier proved that the Lebesgue-Bochner space L p (?,E) , 1texto impreso
The behaviour of compactness under real interpolation is discussed. Classical results due to Krasnosel’skii, Lions-Peetre, Persson and Hayakawa are described, as well as others obtained very recently by Edmunds, Potter, Fernández and the authortexto impreso
En este artículo se describen la estructura y la naturaleza de los sistemas de creencias de un grupo de estudiantes de Secundaria en España y en Bélgica (Flandes) elicitadas a través de un cuestionario diseñado para este fin desde un enfoque sis[...]texto impreso
Martín Peinador, Elena ; Indurain, E. ; Plans, A. ; Rodés-Usán, Álvaro | Editorial de la Universidad Complutense | 1988Let A be an operator from a separable Banach space X into another Banach space Y. For every M-basis (an) of X the authors define two numbers: hA = hA,(an) = infn||A|[an,...]||and HA = HA,(an) = supnm(A|[an,...]), where [ ] stands for closed line[...]
