Symplectic excision

We use time-independent incomplete Hamiltonian flows to excise interesting closed subsets of positive codimension from symplectic manifolds.Examples of such subsets include what we call a "Cantor brush", a "box with a tail", and, more generally, epigraphs of lower semicontinuous functions.This answers a question of Alan Weinstein about excision of a ray, and it generalizes a result of Bernd Stratmann about excision of the product of a ray with a manifold.