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We give an intrinsic (coordinate‐free) construction of the tangent groupoid of a filtered manifold. This is an analogue of Connes' tangent groupoid which is pertinent for the analysis of certain subelliptic differential operators. It is a deformation of the pair groupoid to a bundle of nilpotent groups. We also describe the analogous construction in the context of the adiabatic groupoids of a filtered Lie groupoid.
Bulletin of the London Mathematical Society – Wiley
Published: Dec 1, 2017
Keywords: ; ; ; ;
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