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Show that u(x)=x^2 is quasi-convex.

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Please see mathoverflow.net/faq for reasons why your question is attracting votes to close – Yemon Choi May 9 2011 at 20:37

closed as too localized by Andrey Rekalo, Daniel Litt, Yemon Choi, Igor Rivin, Willie Wong May 9 2011 at 21:12

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