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On the Structure of Lie Pseudo-Groups
Symmetry, integrability and geometry: methods and applications, Tome 5 (2009) Cet article a éte moissonné depuis la source Math-Net.Ru

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We compare and contrast two approaches to the structure theory for Lie pseudo-groups, the first due to Cartan, and the second due to the first two authors. We argue that the latter approach offers certain advantages from both a theoretical and practical standpoint.
Keywords: Lie pseudo-group; infinitesimal generator; jet; contact form; Maurer–Cartan form; structure equations; essential invariant. 
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Peter J. Olver; Juha Pohjanpelto; Francis Valiquette. On the Structure of Lie Pseudo-Groups. Symmetry, integrability and geometry: methods and applications, Tome 5 (2009). http://geodesic.mathdoc.fr/item/SIGMA_2009_5_a76/

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