Smooth compactly supported solutions of some underdetermined elliptic PDE, with gluing applications

Details Smooth compactly supported solutions of some underdetermined elliptic PDE, with gluing applications Smooth compactly supported solutions of some underdetermined elliptic PDE, with gluing applications

2010-03-02

arxiv.org/abs/1003.0535v4

Mathematics

Functional Analysis

(RIC) condition removed, (API) condition weakened, figure and appendix added, some rewording

Scientific paper

We give sufficient conditions for some underdetermined elliptic PDE of any order to construct smooth compactly supported solutions. In particular we show that two smooth elements in the kernel of certain underdetermined linear elliptic operators $P$ can be glued in a chosen region in order to obtain a new smooth solution. This new solution is exactly equal to the starting elements outside the gluing region. This result completely contrasts with the usual unique continuation for determined or overdetermined elliptic operators. As a corollary we obtain compactly supported solutions in the kernel of $P$ and also solutions vanishing in a chosen relatively compact open region. We apply the result for natural geometric and physics contexts such as divergence free fields or TT-tensors.

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