Laplacians and Sub-Laplacians
We have seen in the previous chapters how an elliptic operator can be associated in a natural way with a geometric Riemannian structure. In a similar way sub-elliptic operators arise from similar structures, called sub-Riemannian structures, which will be discussed next. References for sub-Riemannian manifolds are  and .
KeywordsHeat Kernel Left Invariant Vector Horizontal Curve Engel Group Clifford Module
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