# Real Analysis : Proof of a Constant

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Let > 0. Prove that log x x for x large. Prove that there exists a

constant C such that log x Cx for all x 2 [1, 1 ), C ! 1 as ! 0+,

and C ! 0 as ! 1 Please justify all steps and be rigorous because it is an analysis problem.

(Note: The problem falls under the chapter on Differentiability on R in

the section entitled The Mean Value Theorem, and the hint says: Find the

maximum of f(x) = log x/x forx 2 [1, 1 ))

1

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##### Solution Summary

A constant is proven using real analysis.

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