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Math Resources

Expository

Keith Conrad’s Expository Papers - I particularly enjoy his advice on mathematical writing.

Richard Borcherd’s Youtube Channel - Free lectures by a Field’s medalist!

The Infinite Napkin - An introduction to a wide variety of mathematical disciplines.

Complexity Zoo - Catalogues every complexity class out there. Especially useful for the esoteric ones.

Tools

Group Explorer - Interactive Cayley graphs for various finite groups.

Topological Picture Book - Visualise various surfaces in a beautiful cross-hatched artstyle.