However, it is critical to understand . The original copyright dates for Long’s book (published by Charles E. Merrill, later Pearson) mean it is not in the public domain. Unauthorized PDF copies violate copyright law unless hosted by the publisher with permission.

"Introduction to General Topology" by Paul E. Long is a comprehensive and well-structured textbook that provides a thorough introduction to the fundamental concepts of general topology. The book is available in PDF format, making it easily accessible to students and researchers alike.