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Aug 11, 2016 at 15:13 comment added Allen Knutson That's a more familiar fact -- consider the adjoint action, mapping $G\to GL(\mathfrak{g})$. This has connected projective source and affine target, so must be constant.
Aug 10, 2016 at 1:23 comment added John Baez A related surprisingly nice fact is that every connected projective algebraic group is automatically abelian!
Aug 10, 2016 at 0:10 comment added John Baez Great! As Qiaochu pointed out in earlier comments, it's really crucial here that abelian varieties are connected projective algebraic abelian groups. Otherwise the forgetful functor from abelian varieties to pointed varieties would not be full.
Aug 10, 2016 at 0:06 history edited John Baez CC BY-SA 3.0
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Aug 9, 2016 at 18:49 history answered Dmitry Vaintrob CC BY-SA 3.0