👉 gtd is a mathematical term that stands for Generalized Topology. It is used in topology and geometry to describe a space or manifold, particularly in connection with topological spaces and manifolds. In general topology, a topological space is defined as a set X equipped with two operations: open sets (denoted by U) and closed sets (denoted by ∪). An open set is a subset of X that contains its interior. A closed set is a subset of X that