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Feb 5, 2010 at 0:00 comment added Cam McLeman There's a difference?
Feb 4, 2010 at 22:21 comment added Kevin H. Lin How have categories, sheaves, cohomology, etc. changed history? Maybe they've changed mathematical history, but I don't see how they've changed human history at large (yet).
Feb 2, 2010 at 0:51 comment added Harry Gindi +1 for sheaves. I'll also add Yoneda to your list. And remember sheaves are not algebraic geometry, they're pure category theory (with descent given by cech cohomology or classical grothendieck topologies).
Feb 1, 2010 at 15:35 history edited Cam McLeman CC BY-SA 2.5
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Feb 1, 2010 at 14:57 history answered Cam McLeman CC BY-SA 2.5