Prove that f(x) = x/k can be defined on [0, ∞) by the require- ment that it be the inverse function of g(x) = x* on [0, 0), where k is any positive integer. Use the inverse function theorem to derive the usual formula for f'.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Prove that f(x) = x/k can be defined on (0, 0) by the require-
ment that it be the inverse function of g(x) = x*
k is any positive integer. Use the inverse function theorem to
derive the usual formula for f'.
on [0, co), where
Transcribed Image Text:Prove that f(x) = x/k can be defined on (0, 0) by the require- ment that it be the inverse function of g(x) = x* k is any positive integer. Use the inverse function theorem to derive the usual formula for f'. on [0, co), where
Expert Solution
Step 1

According to inverse function theorem suppose  f:D to be any given function and aD with f'a0 there exist open sets U and V such that aU and faV with f:UV is a homomorphism from U onto V and also f-1 is differentiable  and it is given by,

f-1'b=1f'a

Then from the inverse theorem, we have,

f:[0,) is given by,

fx=x1k

And g:[0,) is given by,

fx=xk

 

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