Simple proof for a property of continuous functions related to limits.



If f(x) : D -> R and y(x) : f(D) -> R
And y(x) is a continuous function for every x at f(D).

Now what is the poof that for suitable α, it is true that:

Please look at the following picture, since it's difficult to write
the limit symbols here:
http://i215.photobucket.com/albums/cc34/Crocodile13/monf.jpg

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I have a proof in my mind but it seems unnecessarily complicated and
i feel there must be something else more simple that i miss....


Thanks.

.



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