Let $F:(0,1)\rightarrow (0,1)$ be a non-singular function with respect to the lebesgue measure $\mu$ (so $\mu\sim\mu \circ F$ ) . let $\lbrace f_n/n\in N\rbrace\subset L^{2}([0,1])$ be a sequence of simple integrable functions and $f\in L^{2}([0,1])$ such that $f_n\rightarrow f $ in the 2-norm. is it correct that also $f_n\circ F\rightarrow f\circ F$ ?
If not, what are the conditions on $F$ such that this inplication is correct?
