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- Centre National de la Recherche ScientifiqueFR69 papers
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4 papers · 1 filter
Algebraic and F-Independent sets in 2-firs
A. Leroy, A. Ozturk
Let denote a 2-fir. The notions of F-independence and algebraic subsets of R are defined. The decomposition of an algebraic subset into similarity classes gives a simple way of…
Goldie conditions for Ore extensions over semiprime rings
A. Leroy, J. Matczuk
Let be a ring, an injective endomorphism of and a -derivation of . We prove that if is semiprime left Goldie then the same holds for the Ore extension $R[…
Intersection cohomology of circle actions
Gabriel Padilla, Martintxo Saralegi-Aranguren
A classical result says that a free action of the circle on a topological space is geometrically classified by the orbit space and by a cohomological class ${H}…
The BIC of a singular foliation defined by an abelian group of isometries
M. Saralegi-Aranguren, R. Wolak
We study the cohomology properties of the singular foliation $\F$ determined by an action where the abelian Lie group preserves a riemannian metric on…