Boundary jet
= Boundary jet
{title2=$j^{m-1}u|_{\partial\Omega}$}
The boundary jet through order $m-1$ is the collection of traces $\partial^\alpha u|_{\partial\Omega}$ with $|\alpha|\le m-1$. Vanishing of the whole jet is stronger than vanishing of one <derivative>. On a smooth <hypersurface>, zero normal Cauchy <derivatives> through order $m-1$, together with their tangential <derivatives>, give a zero full boundary jet.