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May 12, 2017 at 11:34 comment added Joël Ouaknine Thanks very much Robert, this is exactly the kind of result I was looking for (but I lack the reputation points to upvote your answer). I think I can just about prove these statements using elementary arguments, plus some facts about real algebraic geometry -- but is this already written up or mentioned somewhere that could be cited directly by any chance?
May 12, 2017 at 11:31 vote accept Joël Ouaknine
May 12, 2017 at 1:23 history answered Robert Israel CC BY-SA 3.0