Monday, June 26, 2017

real analysis - leftfrac1f(xn)right converges to frac1f(x).

Let f:RR be a continuous function. Let {xn}n=1 be a convergent sequence in R with lim and f(x)\ne 0



I want to show that \left\{\frac{1}{f(x_n)}\right\} converges to \frac{1}{f(x)}.



Now It would seem I have:




|f(x_n) - f(x)| \lt \epsilon
|f(x_n) - f(x)| \leq |f(x_n)| - |f(x)|



and now I don't get it, I would expect to get some relationship also less than epsilon, times by -1 to inverse the epsilon inequality and then find a way to get the ricipricals and that would reverse the epsilon inequality again giving me the result, but I can't see it.

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