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convex/cocave function?

 
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May5-09, 01:40 AM   #1
 

convex/cocave function?

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]?
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May5-09, 03:39 AM   #2
 
Find the sign of f''(x).
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