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Kühnel, Wolfgang ; Pfender, Michael ; Meseguer Guaita, José ; Sols, Ignacio | Hindawi Publishing Corporation | 1982In the present paper we want to give a common structure theory of left action, group operations, R-modules and automata of different types defined over various kinds of carrier objects: sets, graphs, presheaves, sheaves, topological spaces (in p[...]texto impreso
Almost holomorphic embeddings in Grassmannians with applications to singular symplectic submanifolds
In this paper we use Donaldson's approximately holomorphic techniques to build embeddings of a closed symplectic manifold with symplectic form of integer class in the Grassmannians Gr(r, N). We assure that these embeddings are asymptotically hol[...]texto impreso
This paper discusses the construction of asymptotically holomorphic embeddings of a (2n?1) -dimensional contact manifold into the projective space CP 2n+1 such that the image is weakly dominated by the symplectic form. The proof follows the s[...]texto impreso
From the authors' text: "In the present paper we propose the framework of semimodule categories and their subcategories as a suitable common framework for various automata and control theories, including in particular those of determinist[...]texto impreso
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Let Hilb d P 2 =Hilb d P 2 C denote the Hilbert scheme parametrizing 0-dimensional, length-d subschemes of the plane. The authors determine an additive basis for the Chow group A.(Hilb d P 2 ) consisting of classes of closures of locally clo[...]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
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Gallego Rodrigo, Francisco Javier ; Giraldo Suárez, Luis ; Sols, Ignacio | America Mathematical Society | 1996-10In this paper we provide a sharp bound for the dimension of a family of ruled surfaces of degree d in P3 K. We also _nd the families with maximal dimension: the family of ruled surfaces containing two unisecant skew lines, when d _ 9 and the fam[...]texto impreso
The aim of this note is to prove some bounds on the global sections of vector bundles over a smooth, complete and connected curve C . Just by an application of the Clifford theorem, the authors prove (Proposition 2) (*) h 0 (E)?deg(E)/2+2 for a[...]texto impreso
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We give a complete classification of smooth congruences - i.e. surfaces in the Grassmann variety of lines in P 3C identified with a smooth quadric in P5- of degree at most 8, by studying which surfaces of P5can lie in a smooth quadric and provin[...]texto impreso
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Let Gr l,n be the Grassmann variety of l -dimensional subspaces of an n -dimensional vector space V over an algebraically closed field k . Let ?(W)={??Gr l,n : ??W?0} denote the special Schubert variety associated to a subspace W of V . The[...]texto impreso
Phenomenological implications of the volume of the Calabi-Yau threefolds on the hidden and observable M-theory boundaries, together with slope stability of their corresponding vector bundles, constrain the set of Kahler moduli which give rise to[...]
