The primary legal source for reading or borrowing " An Introduction to General Topology
One of the most powerful concepts in topology. Long defines open covers and subcovers, then contrasts sequential compactness (in metric spaces) with compactness in general spaces. The Heine-Borel theorem is proved as a special case. He also covers the finite intersection property and compact subspaces of Hausdorff spaces. an introduction to general topology paul e long pdf link
A concise review of set theory, including De Morgan’s laws, relations, functions, and the axiom of choice. Long assumes the reader has mathematical maturity but provides a safety net. The primary legal source for reading or borrowing
: A secondary portal to check availability and borrow the work. Core Topics and Chapter Overview He also covers the finite intersection property and
You can also try checking online libraries or requesting the book through interlibrary loan services.
If you need an open-access introductory textbook on general topology, several reputable professors and institutions host free, comprehensive PDF notes and books online: