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Jan 16, 2010 at 4:33 comment added Emerton I think Evgeny's example is a good one to keep in mind. (As Pete Clark wrote in his answer, restriction of scalars is just the process of thinking of a ${\mathbb C}$-variety, say, as an ${\mathbb R}$-variety instead.)
Dec 29, 2009 at 5:15 comment added Evgeny Shinder As other people commented, for a definition and properties you could check out wikipedia first. I gave you an example. And I do believe that this kind of stuff is easy.
Dec 5, 2009 at 21:36 comment added user2292 Giving the points over one field of a torus doesn't even begin to describe it. the comment "it's not hard at all" is useless and patronising.
Dec 4, 2009 at 6:15 history answered Evgeny Shinder CC BY-SA 2.5