\input zb-basic \input zb-ioport \iteman{io-port 06078573} \itemau{Yumei, Ma; Dong, Nan; Lijun, Liu} \itemti{An approximation problems on $L_2(R)$ by wavelet neural network.} \itemso{Int. Math. Forum 7, No. 9-12, 603-607 (2012).} \itemab Summary: Suppose that $\sigma $ is a sigmoidal function, Li Xin showed that a linear combination of dilates and translates of generates a near tight wavelet frame for $L_2(R)$. This paper extend Li Xin' s result and firstly generalize the definite field $I_\pi $to $R^n$, secondly show the approximate problem on a compact set of $L_2(R)$. \itemrv{~} \itemcc{} \itemut{neural network; frame of wavelet} \itemli{http://www.m-hikari.com/imf/imf-2012/9-12-2012/index.html} \end