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…between geometry in a plane, on a sphere, and hyperbolic space. In his Elements, Euclid systematized the Greeks' knowledge of geometry (around 300 BCE). Beginning with a set of fundamental definitions and just five axioms, Euclid deduced all other known geometric results. For the next 2000 years, mathematicians attempted to prove that Euclid's…
https://www.wichita.edu/academics/fairmount_las/mathematics/SKD/_old-files/2020-schedule.pcf.php