170,134 research outputs found
Patologia comportamentale : il gatto che sporca in casa: due casi esemplificativi del problema
No full textThis paper describes two cases of housesoiling problems in cats. In both clinical cases, environmental changes induced the onset of the problem. In the first case, housesoiling was the only behavioural problem and no major changes in other behaviours were reported. The therapy in this case only implied environmental modifications and modifications of the pet-owner relationship. In the second case the patient presented, along with the housesoiling problem, other behavioural symptoms. This more complex behavioural picture induced us to prescribe both a psychiatric drug (Fluoxetine) and some behavioural modification
Adeguamenti statutari delle società quotate alla legge n. 262/2005 e al d.lgs. n. 303/2006
No full text
An iterative construction of Gorenstein ideals
No full textWe present a method to inductively construct Gorenstein ideals of any codimension c. We start from a Gorenstein ideal I of codimension c contained in a complete intersection ideal J of the same codimension, and we prove that under suitable hypotheses there exists a new Gorenstein ideal contained in the residual ideal I : J. We compare some numerical data of the starting and the resulting Gorenstein ideals of the construction. We compare also the Buchsbaum-Eisenbud matrices of the two ideals, in the codimension three case. Furthermore, we show that this construction is independent from the other known geometrical constructions of Gorenstein ideals, providing examples
Le decisioni non assembleari
No full textin Trattato delle società a responsabilità limitata, diretto da C. Ibba e G. Marasa
Diritti dei soci, interesse sociale e funzionamento dell’assemblea: spunti dalle norme di emergenza
No full textSmooth determinantal varieties and critical loci in multiview geometry
No full textLinear projections from Pk to Ph appear in computer vision as models of images of dynamic or segmented scenes. Given multiple projections of the same scene, the identification of sufficiently many correspondences between the images allows, in principle, to reconstruct the position of the projected objects. A critical locus for the reconstruction problem is a variety in Pk containing the set of points for which the reconstruction fails. Critical loci turn out to be determinantal varieties. In this paper we determine and classify all the smooth critical loci, showing that they are classical projective varieties
Families of critical loci in multiview geometry
No full textLinear projections from P^k to P^h model pinhole cameras in the context of
Computer Vision or Multiview Geometry. It is well known that, given two sets of n
projections P_1,...,P_n and Q_1,...,Q_n, there exist sets of points that have the same images
when projected from the two different sets of projection. Such points fill the so–called
critical locus for the reconstruction problem for the two sets of projections. In the present
paper, we address the problem of describing the critical loci that arise when we keep
fixed Q_1,...,Q_n and we allow P_1,...,P_n to vary. In particular, we construct a suitable
space that parameterizes the projections P_1,...,P_n, provide an embedding of such space
into a suitable Grassmann variety, and construct a map from that space to the Hilbert
scheme of closed subschemes in P^k. The subscheme of the Grassmannian corresponding
to projections for which the critical locus is the whole P^k is completely characterized,
while the fibers of the map above are studied in the case of two projections
Smooth determinantal varieties and critical loci in multiview geometry
No full textLinear projections from P^k to P^h appear in computer vision as models of images of
dynamic or segmented scenes. Given multiple projections of the same scene, the identification of sufficiently many correspondences between the images allows, in principle, to reconstruct the position of the projected objects. A critical locus for the reconstruction problem is a variety in P^k containing the set of points for which the reconstruction fails. Critical loci turn out to be determinantal varieties. In this paper we determine and classify all the smooth critical loci, showing that they are classical projective varieties
On the description and identifiability analysis of experiments with mixtures
No full textIn a mixture experiment the collinearity problems, implied by the sum to one functional relationship among the factors, have strong consequences on the identification and analysis of regression models for such designs. Here to address these problems, mixture designs are represented as sets of homogeneous polynomials. Techniques from computational commutative algebra are employed to deduce generalized confounding relationships on power products, and to determine families of identifiable models
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