Convergence of a sequence of functions and their inverses
consider a sequence of continuous and bijective functions $f_n:\mathbb{R}\rightarrow\mathbb{R}$, such that their inverses $f^{-1}_n:\mathbb{R}\rightarrow\mathbb{R}$ are continuous as well. Furthermore let us assume the function $f(x):=\lim\limits_{n\rightarrow \infty}f_n(x)$ is continuous, bijective and his inverse $f^{-1}$ is continuous.
I want to prove or disprove that in this case the following relation holds:
$$f^{-1}(x):=\lim\limits_{n\rightarrow \infty}f_n^{-1}(x)$$
By now I couldn't prove the statement, but there are a couple of examples which seems to confirm this claim. Do you have any idea?
Best regards
Let $\epsilon>0$.
Because $f^{-1}$ is continuous we can choose $\delta$ such that $$|f^{-1}(x+\delta)-f^{-1}(x)|<\epsilon\ \ \ \text{ and }\ \ \ |f^{-1}(x-\delta)-f^{-1}(x)|<\epsilon$$
Because $f_n\to f$ there is $N$ such that for $n>N$,
$$|f_n(f^{-1}(x+\delta))-(x+\delta)|<\delta\ \ \ \ \text{ and }\ \ \ \ |f_n(f^{-1}(x-\delta))-(x-\delta)|<\delta$$
Therefore
$$f_n(f^{-1}(x+\delta))>x\ \ \ \ \text{ and }\ \ \ \ f_n(f^{-1}(x-\delta))<x$$
Using that the $f_n^{-1}$ must be monotonic, $f_n^{-1}(x)$ is between $f^{-1}(x-\delta)$ and $f^{-1}(x+\delta)$. But these two are in the interval $\left[f^{-1}(x)-\epsilon,f^{-1}(x)+\epsilon\right]$.
Therefore $$|f_n^{-1}(x)-f^{-1}(x)|<\epsilon\ \ \ \ \text{ for }n>N$$