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Dec 21, 2010 at 19:12 vote accept CommunityBot
Dec 21, 2010 at 16:17 comment added Sergei Ivanov @Anton: see update.
Dec 21, 2010 at 16:16 history edited Sergei Ivanov CC BY-SA 2.5
added an explicit example
Dec 21, 2010 at 11:23 comment added user1688 Great. That takes care of the general case. But what if we assume that $T$ preserves the $\mathbb Q$-span of the basis $(e_j)$?
Dec 20, 2010 at 22:32 history edited Sergei Ivanov CC BY-SA 2.5
minor clarification
Dec 20, 2010 at 22:26 history answered Sergei Ivanov CC BY-SA 2.5