Abstract
We introduce the concept of Engel manifold, as a manifold that resembles locally the Engel group, and find the integrability conditions of the associated sub-elliptic system \(Z_1 f = a_1\), \( Z_2 f = a_2\). These are given by \( Z_1^2 a_2 = (Z_1 Z_2 +[Z_1, Z_2]) a_1\), \( Z_2^3 a_1 = (Z_2^2 Z_1 - Z_2 [Z_1, Z_2] - [Z_2, [Z_1, Z_2] ]) a_2\). Then an explicit construction of the solution involving an integral representation is provided, which corresponds to a Poincaré-type lemma for the Engel’s distribution.
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This research project is partially supported by Hong Kong RGC competitive earmarked research grants \(\#\)601813, \(\#\)601410.
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Calin, O., Chang, DC. & Hu, J. Integrability conditions on Engel-type manifolds. Anal.Math.Phys. 5, 217–231 (2015). https://doi.org/10.1007/s13324-015-0107-3
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DOI: https://doi.org/10.1007/s13324-015-0107-3
Keywords
- Engel vector fields
- Sub-Riemannian geometry
- Integrability conditions
- Poincaré lemma
- Heisenberg distribution