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Invertibility in tensor products of Q-algebras

2002

AlgebraTensor contractionTensor productTensor product of algebrasGeneral MathematicsTensor (intrinsic definition)Tensor product of Hilbert spacesRicci decompositionSymmetric tensorTensor product of modulesMathematicsStudia Mathematica

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Proper triangular Ga-actions on A^4 are translations

2013

We describe the structure of geometric quotients for proper locally triangulable additve group actions on locally trivial A^3-bundles over a noetherian normal base scheme X defined over a field of characteristic 0. In the case where dim X=1, we show in particular that every such action is a translation with geometric quotient isomorphic to the total space of a vector bundle of rank 2 over X. As a consequence, every proper triangulable Ga-action on the affine four space A^4 over a field of characteristic 0 is a translation with geometric quotient isomorphic to A^3.

Algebraaffine spacesMathematics - Algebraic GeometryAlgebra and Number Theorygeometric quotientFOS: Mathematics14L30; 14R20; 14R25[MATH.MATH-AG]Mathematics [math]/Algebraic Geometry [math.AG]Algebraic Geometry (math.AG)proper additive group actionsMathematics[ MATH.MATH-AG ] Mathematics [math]/Algebraic Geometry [math.AG]

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Anthropocène, Sémiotique et Droit de l’Environnement. La remise en cause juridique des non-humains

2023

The Anthropocene is not a time of a crisis of nature, but a time of an epistemic one. That stimulates the semiotics of culture to take up the project of an archaeology of knowledge. In this article, we give some indications of how to deal with this in the discourse of environmental law. We will focus on the turning point of the 1960s and 1970s, which is very significant for environmental law. Based on a corpus including French national law, international law and European regulations, we will start by proposing a semiotic genealogy of natural spaces ; then, we will show how it leads to the reformulation of legal temporalities ; finally, we will end by evoking its repercussions on the actoria…

Anthropocene Environemental Law Natural Spaces Subject of Law TemporalitySettore M-FIL/05 - Filosofia E Teoria Dei Linguaggi

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Visible parts and dimensions

2003

We study the visible parts of subsets of n-dimensional Euclidean space: a point a of a compact set A is visible from an affine subspace K of n, if the line segment joining PK(a) to a only intersects A at a (here PK denotes projection onto K). The set of all such points visible from a given subspace K is called the visible part of A from K. We prove that if the Hausdorff dimension of a compact set is at most n−1, then the Hausdorff dimension of a visible part is almost surely equal to the Hausdorff dimension of the set. On the other hand, provided that the set has Hausdorff dimension larger than n−1, we have the almost sure lower bound n−1 for the Hausdorff dimensions of visible parts. We al…

Applied MathematicsMathematical analysisMinkowski–Bouligand dimensionMathematics::General TopologyGeneral Physics and AstronomyDimension functionStatistical and Nonlinear PhysicsUrysohn and completely Hausdorff spacesEffective dimensionCombinatoricsPacking dimensionHausdorff distanceHausdorff dimensionMathematics::Metric GeometryHausdorff measureMathematical PhysicsMathematicsNonlinearity

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Our Friend and Mathematician Karl Strambach

2020

This paper is dedicated to Karl Strambach on the occasion of his 80th birthday. Here we want to describe our work with Prof. Karl Strambach.

Applied Mathematicsimprimitive groupGrünwald spaces shells of curve010102 general mathematicsgroup theoryArt historyloop01 natural sciencescomplex curveLie group010101 applied mathematicsHjelmslev geometryMathematics (miscellaneous)Work (electrical)Mathematikalgebraic groupaffine connectionSettore MAT/03 - Geometria0101 mathematicsMathematicsBiographiebibliographiegeodesics

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Golden eagle, Águila real (VER0000161)

Altres noms vulgars: Golden eagle (Anglès), Aigle royal (Francès), Steinadler (Alemany) Gabinet de Vertebrats (Departament de Zoologia), Facultat de Ciències Biològiques (Campus de Burjassot), C/ Doctor Moliner, s/n, Bloque B. 5é plant, Burjassot (Valencia). Armari: 4-2 Juvenil