: A secondary listing and lending service for the same archive can be found at Open Library .
The heart of the introduction. Long defines a topology, open sets, closed sets, and the axioms (the empty set and whole space are open; finite intersections and arbitrary unions of open sets are open). He provides numerous examples: the discrete topology, indiscrete topology, finite complement topology, and the usual topology on the real line. an introduction to general topology paul e long pdf link
: Download the highly structured, complete General Topology Notes hosted by the University of Edinburgh. : A secondary listing and lending service for
If you cannot find Long’s book, consider these free and legal topology texts: finite complement topology