I'm looking for a proof of the following statement:

If lim f(x) exists, then lim nth root [ f(x) ] = nth root [ lim f(x) ]

I can't seem to find a proof in any Calculus/Analysis books.

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- October 22nd 2011, 07:58 AMAlfieLimit of the nth root of a function
I'm looking for a proof of the following statement:

If lim f(x) exists, then lim nth root [ f(x) ] = nth root [ lim f(x) ]

I can't seem to find a proof in any Calculus/Analysis books. - October 22nd 2011, 08:16 AMemakarovRe: Limit of the nth root of a function
If , then this holds by the chain rule (the statement about the limit of composition) since is continuous for .