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WALTER DE GRUYTER |
Documentos disponibles de esta editorial (24)
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In this paper we study the normal bundle of the embedding of subvarieties of dimension n - 1 in the Grassmann variety of lines in P(n). Making use of some results on the geometry of the focal loci of congruences ([4] and [5]), we give some crite[...]![]()
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Lie algebra model theory studies the closure O() of the Gln(C)-orbit in the variety Ln of Lie algebra laws of a law on Cn using nonstandard analysis. In this context, given a Lie algebra law , a contraction of is a law ? with ? 2 O(). On the o[...]![]()
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We compute the ?rst and second cohomology groups with coe?cients in the adjoint module of frobeniusian model algebras whose parameters move in a dense open subset of C p?1, and obtain upper bounds for the dimension of cohomology groups of froben[...]![]()
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In this work we study the Positive Extension (pe) property and Hilbert's 17th problem for real analytic germs and sets. A real analytic germ X-0 of R-0(n) has the pe property if every positive semidefinite analytic function germ on X-0 has a pos[...]![]()
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In this work we develop new techniques to compute Koszul cohomology groups for several classes of varieties. As applications we prove results on projective normality and syzygies for algebraic surfaces. From more general results we, obtain in pa[...]![]()
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We give the list of all possible smooth congruences in G(1,n) which have a quadric bundle structure over a curve and we explicitely construct most of them.![]()
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Andradas Heranz, Carlos ; Díaz-Cano Ocaña, Antonio ; Ruiz Sancho, Jesús María | WALTER DE GRUYTER | 2003We solve the 17th Hilbert Problem and prove the Artin-Lang property for normal real analytic surfaces. Then we deduce that the absolute (resp. relative) holomorphy ring of such a surface consists of all bounded (resp. locally bounded) meromorphi[...]