Results 11 to 20 of about 9,595,562 (308)
Is every toric variety an M-variety? [PDF]
manuscripta mathematica, 2005 A complex algebraic variety X defined over the real numbers is called an M-variety if the sum of its Betti numbers (for homology with closed supports and coefficients in Z/2) coincides with the corresponding sum for the real part of X.
A. Borel +16 more
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Journal of Economic Dynamics and Control, 2012 Countercyclical markups are a key transmission mechanism in many endogenous business cycle models. Yet, recent findings suggest that aggregate markups in the US are procyclical. The current model adresses this issue.
Mark Weder, Oscar Pavlov
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Annales Henri Poincaré, 2021 AbstractWe consider algebraic varieties canonically associated with any Lie superalgebra, and study them in detail for super-Poincaré algebras of physical interest. They are the locus of nilpotent elements in (the projectivized parity reversal of) the odd part of the algebra.
Richard Eager +2 more
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Secant varieties of Grassmann varieties [PDF]
Proceedings of the American Mathematical Society, 2004 In this paper we discuss the dimensions of the (higher) secant varieties to the Grassmann varieties, embedded via the Plucker embeddings. We use Terracini's Lemma and the duality in the exterior algebra of a finite dimensional vector space to translate the problem into that of finding the dimension of a graded piece of a " fat" ideal in the exterior ...
GIMIGLIANO, ALESSANDRO +2 more
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Bulletin of the London Mathematical Society, 2008 Algebraic varieties which are locally isomorphic to open subsets of affine space will be called {\em plain}. Plain varieties are smooth and rational. The converse is true for curves and surfaces, and unknown in general. It is shown that plain varieties are stable under blowup in smooth centers.
Bodnar, Gabor +3 more
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Transactions of the American Mathematical Society, 1992 Numerical algorithms involving Hessenberg matrices correspond to dynamical systems which evolve on the subvariety of complete flags S 1 ⊂ S 2 ⊂ ⋯ ⊂ S n −
DE MARI CASARETO DAL VERME, FILIPPO +2 more
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Diptych varieties. II: Apolar varieties
Advanced Studies in Pure Mathematics, 2018 24 pages. A tribute to Yujiro Kawamata, to appear in his sixtieth birthday conference proceedings, ASPM 2015. The webpage at http://homepages.warwick.ac.uk/staff/G.Brown/diptych.html contains links to auxiliary material. (First update adds more detail to calculations of polars and includes a new key variety to handle small cases all together.
Brown, Gavin, Reid, Miles
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Proceedings of the London Mathematical Society, 2016 Exponential varieties arise from exponential families in statistics. These real algebraic varieties have strong positivity and convexity properties, familiar from toric varieties and their moment maps. Among them are varieties of inverses of symmetric matrices satisfying linear constraints. This class includes Gaussian graphical models.
Michałek, Mateusz +3 more
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International Journal of Algebra and Computation, 2009 A class [Formula: see text] of algebras with a distinguished constant term 0 is called Fregean if congruences of algebras in [Formula: see text] are uniquely determined by their 0–cosets and ΘA (0,a) = ΘA (0,b) implies a = b for all [Formula: see text]. The structure of Fregean varieties is investigated. In particular it is shown that every congruence
Idziak, Paweł +2 more
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Economical and Morpho-Biological Features of Whiner Wheat New Generation Varieties (Triticum durum)
Plant Varieties Studying and Protection, 2010 The article describes summary of the researches, characteristics of morphological and agro-biological characteristics and features, a note is made of a significant progress in the selection of productivity and adaptability of registered Durum Winter ...
Л. І. Улич +3 more
doaj +1 more source