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Interval DatatypeThis page has a few interesting looking papers. I stumbled here because of the paper titled "A universal characterization of the closed Euclidean interval" (PDF)*. It contains a simple categorical definition of a notion of closed [edit] * The google search term I was using was actually "essential geometric morphism" which I was looking up with regards to topos theory and synthetic differential geometry. By Derek Elkins at 20060211 16:52  LtU Forum  previous forum topic  next forum topic  other blogs  10567 reads

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