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Convex/cocave function?

  1. May 5, 2009 #1
    Is it true that [tex]f(x)=x^a[/tex] is always a strictly convex function for [tex]a>1[/tex] on [tex](0,\infty)[/tex]?
  2. jcsd
  3. May 5, 2009 #2
    Find the sign of f''(x).
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