Mendelson's text is structured classically: Set Theory $\to$ Metric Spaces $\to$ Topological Spaces $\to$ Compactness/Connectedness.

Foundations, Logic, and Countability.

If you are interested in learning more about topology, here are some further resources:

When you rely on external solutions, be aware of these frequent errors:

: Mendelson spends a good deal of time on metric spaces. If you understand the -