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The definition of a topology, neighborhoods, accumulation points, and closure. an introduction to general topology paul e long pdf link
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An Introduction to General Topology by Paul E. Long remains a valuable resource for learners who prefer a direct and intuitive introduction to the subject. By balancing rigor with clarity, it provides a solid foundation for further study in mathematics. If you are on a budget
: Students preparing for advanced geometry, functional analysis, or algebraic topology.