Abstract
We prove a Bishop volume comparison theorem and a Laplacian comparison theorem for three-dimensional contact sub-Riemannian manifolds with symmetry.
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Acknowledgements
The authors would like to thank N. Garofalo for stimulating discussions.
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Communicated by Der-Chen Edward Chang.
The first author was partially supported by the PRIN project and the second author was supported by the NSERC postdoctoral fellowship.
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Agrachev, A., Lee, P.W.Y. Bishop and Laplacian Comparison Theorems on Three-Dimensional Contact Sub-Riemannian Manifolds with Symmetry. J Geom Anal 25, 512–535 (2015). https://doi.org/10.1007/s12220-013-9437-2
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DOI: https://doi.org/10.1007/s12220-013-9437-2