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Dec 3, 2014 at 22:15 history edited Jinbi Wang CC BY-SA 3.0
Rewrote the question to make it more clear
Jul 27, 2014 at 22:35 answer added S. Carnahan timeline score: 2
Jul 27, 2014 at 16:23 comment added Jinbi Wang Dear Zhen Lin, thanks for pointing this out.
Jul 27, 2014 at 16:17 comment added Zhen Lin Question 1: This is just abstract nonsense: if a morphism factors through a monomorphism, then pulling back (or, base change, if you like) along that monomorphism doesn't do anything.
Jul 27, 2014 at 16:05 history asked Jinbi Wang CC BY-SA 3.0