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Algebra
Equations, structures, and how symbols work together.
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Calculus
Rates of change, accumulation, and limits, seen through pictures.
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Geometry
Proofs by picture, from familiar theorems to surprising results.
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Probability
Intuition about chance and the paradoxes that fool us.
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Number theory
Primes, congruences, and Euclid's short proofs.
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