A colleague of mine just shared these with me. This seems to have a more general introduction (i.e., an introduction with less assumed knowledge) than does Dr. Hatcher’s book.
Some writings of a mathematical amateur
A Caffeine-Inspired Advice Blog
A Complete Web Serial
the road is life
author / Bardolator / thespian
"A good stock of examples, as large as possible, is indispensable for a thorough understanding of any concept, and when I want to learn something new, I make it my first job to build one." - Paul Halmos
Come for the math, stay for the puns
computing with space | open notebook
It's time to be inspired, become encouraged, and get uplifted!
Ruminations of a Graduate Class
Explorations in better, faster, stronger code.
Right at least once with high probability
A rambling narrative of one man's journey through mathematics
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You Better Watch Out, I’m Gonna Cry, I’m Gonna Pout, Maybe I’ll Tell You Why