👉 Holohedry is a concept in topology that refers to the property of a topological space where every point has an open neighborhood (a neighborhood which contains all its limit points) such that each interior point has an open neighborhood containing it. It was first introduced by John Nash in 1965 as a condition for a simple connected graph to be a tree. In other words, a holohedron is a topological space where every point has a neighborhood which is both open and
