Question: a) Prove that r is differentiable on (0, ) with b) Prove that rʹ is C and convex on (0, ). r'(x) = | e-:

a) Prove that r is differentiable on (0, ˆž) with
A) Prove that r is differentiable on (0, ˆž) with b)

b) Prove that rʹ is Cˆž and convex on (0, ˆž).

r'(x) = | e-: log t dt.

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