Editing Chapter 2: An ancient theorem and a modern question
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[[File:Aeef84ebc9b315a863ff5dbd293254b4.gif|thumb|Hyperogue is a video game that takes place on the hyperbolic plane.]] | [[File:Aeef84ebc9b315a863ff5dbd293254b4.gif|thumb|Hyperogue is a video game that takes place on the hyperbolic plane.]] | ||
[[File:Pythagorean.svg|thumb|The sum of the areas of the two squares on the legs (a and b) equals the area of the square on the hypotenuse (c).]] | |||
== Preliminaries == | == Preliminaries == |