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Lecture 9: Three Fundamental Theorems

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Lecture 8: Impossible Constructions

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Lecture 7: The Independence of the Parallel Postulate

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Lecture 6: How Many Irrational Numbers are there?

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Lecture 5: Existence of Irrational Numbers

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Lecture 4b: Platonic Solids

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Lecture 4a: Polygonal Tilings

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