Universal connections on Lie groupoids.
Vassiliou, Efstathios, Nikolopoulos, Apostolos (2003)
International Journal of Mathematics and Mathematical Sciences
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Vassiliou, Efstathios, Nikolopoulos, Apostolos (2003)
International Journal of Mathematics and Mathematical Sciences
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Paulette Libermann (2007)
Banach Center Publications
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We outline some of the tools C. Ehresmann introduced in Differential Geometry (fiber bundles, connections, jets, groupoids, pseudogroups). We emphasize two aspects of C. Ehresmann's works: use of Cartan notations for the theory of connections and semi-holonomic jets.
Paul S. Muhly, Dana P. Williams
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We study the C*-algebras of Fell bundles. In particular, we prove the analogue of Renault's disintegration theorem for groupoids. As in the groupoid case, this result is the key step in proving a deep equivalence theorem for the C*-algebras of Fell bundles.
Ivan, Gheorghe (2001)
Balkan Journal of Geometry and its Applications (BJGA)
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Jan Kubarski (1987)
Colloquium Mathematicae
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Jean-Louis Tu, Ping Xu, Camille Laurent-Gengoux (2004)
Annales scientifiques de l'École Normale Supérieure
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Ivan, Gh. (1999)
Balkan Journal of Geometry and its Applications (BJGA)
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Jean Pradines (2007)
Banach Center Publications
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The geometric understanding of Cartan connections led Charles Ehresmann from the Erlangen program of (abstract) transformation groups to the enlarged program of Lie groupoid actions, via the basic concept of structural groupoid acting through the fibres of a (smooth) principal fibre bundle or of its associated bundles, and the basic examples stemming from the manifold of jets (fibred by its source or target projections). We show that the remarkable relation arising between the actions...
Stevanović, Nebojša, Protić, Petar P. (1999)
Novi Sad Journal of Mathematics
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V. Sathyabhama (1977)
Publications de l'Institut Mathématique
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Piotr Stachura (2000)
Banach Center Publications
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V. Sathyabhama (1977)
Matematički Vesnik
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Celakoska-Jordanova, Vesna (2010)
Mathematica Balkanica New Series
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AMS Subj. Classification: 03C05, 08B20 Free algebras are very important in studying classes of algebras, especially varieties of algebras. Any algebra that belongs to a given variety of algebras can be characterized as a homomorphic image of a free algebra of that variety. Describing free algebras is an important task that can be quite complicated, since there is no general method to resolve this problem. The aim of this work is to investigate classes of groupoids, i.e. algebras...