Definition 4.2.32B94F86FC31D

Definition 4.2.3.2B94F86FC31D A set $A\subset \Omega $ is thin at a point $x\in \Omega $ if either $x$ does not belong to the Euclidean closure of $A\setminus \{ x\} $, or there is a subharmonic function $u$ on a Euclidean open neighborhood of $x$ such that