Let $(M,g)$ be a Riemannian manifold and let $N$ be a compact hypersurface isometrically embedded into $M$ and let $eta$ denote a selection of unit regular vector discipline on $N$. It’s then true that $N$ admits an $varepsilon$-tubular neighborhood. That’s, there exists some $varepsilon>0$ such that the conventional exponential $exp(teta)$ is a diffeomorphism onto itsRead more