. It was about how things hold together when you stretch them, pull them, but never tear them. đź’ˇ The Revelation Leo looked back at the PDF. The symbols
Because the book is a high-level reference, it is often out of print or extremely expensive in its physical "Sigma Series" editions.
"General Topology" by Ryszard Engelking is a well-known and highly regarded textbook in the field of topology. Here's a report on the PDF version of the book:
needed before diving into Engelking, or are you looking for a specific chapter-by-chapter walkthrough
Formal "buy-to-own" PDF licenses from major retailers are not currently active, but the following resources exist for research: