Almost commutative -seminormed -algebras. (-algèbres -semi-normées presque commutatives.)
El Kinani, Abdellah (2004)
Revista Colombiana de Matemáticas
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El Kinani, Abdellah (2004)
Revista Colombiana de Matemáticas
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Barlet-Mathieu, Cécile (2003)
Journal of Lie Theory
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Ahmed Bouziad (1997)
Fundamenta Mathematicae
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The main result is slightly more general than the following statement: Let f: X → Y be a quasi-perfect mapping, where X is a regular space and Y a Hausdorff totally non-meagre space; if X or Y is χ-scattered, or if Y is a Lasnev space, then X is totally non-meagre. In particular, the product of a compact space X and a Hausdorff regular totally non-meagre space Y which is χ-scattered or a Lasnev space, is totally non-meagre.
Robert Cauty (1998)
Fundamenta Mathematicae
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We prove that a k-dimensional hereditarily indecomposable metrisable continuum is not a -valued absolute retract. We deduce from this that none of the classical characterizations of ANR (metric) extends to the class of stratifiable spaces.
Le Roux, Frederic (2005)
Geometry & Topology
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Alev, J., Farinati, M.A., Lambre, T., Solotar, A.L. (2000)
AMA. Algebra Montpellier Announcements [electronic only]
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C. Bachoc, S.-H. Kwon (1992)
Acta Arithmetica
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Robert Cauty (1999)
Fundamenta Mathematicae
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R. Choukri (2001)
Extracta Mathematicae
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Gilles Didier (1998)
Acta Arithmetica
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Jean-Baptiste Butruille (2007)
Annales de l’institut Fourier
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On s’intéresse à l’espace de twisteurs réduit d’une variété presque hermitienne, en relisant un article de N.R.O’Brian et J.H.Rawnsley (Ann. Global Anal. Geom., 1985). On traite la question laissée ouverte de la dimension 6. Cet espace est muni d’une structure presque complexe en utilisant la distribution horizontale de la connexion hermitienne canonique. On montre qu’une condition nécessaire d’intégrabilité de est que la variété soit de type dans la classification de Gray et Hervella....