Isomorphism in Wavelets

Abstract

Two scaling functions $\varphi_A$ and $\varphi_B$ for Parseval frame wavelets are algebraically isomorphic, $\varphi_A \simeq \varphi_B$, if they have matching solutions to their (reduced) isomorphic systems of equations. Let $A$ and $B$ be $d\times d$ and $s\times s$ \thematrix matrices with $d, s\geq 1$ respectively and let $\varphi_A$ be a scaling function associated with matrix $A$ and generated by a finite solution. There always exists a scaling function $\varphi_B$ associated with matrix $B$ such that \begin{equation*} \varphi_B \simeq \varphi_A. \end{equation*} An example shows that the assumption on the finiteness of the solutions can not be removed.