Characterizing topologies by continuous selfmaps

Various topological spaces are examined in an effort to describe topological spaces from a knowledge of their class of continuous selfmaps or their class of autohomeomorphisms. Relationships between topologies and their continuous selfmaps are considered. Several examples of topological spaces are given and their corresponding classes of continuous selfmaps are described completely. The problem, given a set X and a topology U when does there exist a topology V either weaker or stronger than U such that the class of continuous selfmaps of (X,V) contains the class of continuous selfmaps of (X,U), is considered. M* and S** spaces are defined and some their properties are considered. Two M* (or S**) spaces are shown to be homeomorphic if and only if certain semigroups of continuous selfmaps are isomorphic --Abstract, page ii