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The Parallel Postulate
Euclide wrote geometry as an axiomatic system. He said if you believe this and this and this, these so-called axioms, you just postulate them. And for the most part, Euclide's postulates for geometry were pretty straightforward. But there was one postulate that seemed a little bit more specific than others. For many, many years, people thought, well, maybe it's not supposed to be an axiom or a postulate. You can't as it turns out.