Convex/cocave function?

  • Thread starter Edwinkumar
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  • #1
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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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  • #2
Find the sign of f''(x).
 

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