Doubling properties and unique continuation at the boundary for elliptic operators with singular magnetic fields
Xiangxing Tao · Studia Mathematica · 2002
Let $u$ be a solution to a second order elliptic equation with singular magnetic fields, vanishing continuously on an open subset ${\mit \Gamma }$ of the boundary of a Lipschitz domain. An elementary proof of the doubling property for $u^2$ over balls cen