Suppose that η_1,...,η_n are measurable functions in L^2(R).We call the n-tuple(η_1,...,η_n) a Parseval super frame wavelet of length n if {2^(k/2) η_1(2~kt-l) ⊕···⊕2^(k/2) η_n(2~kt-l):k,l∈Z} is a Parseval frame for L^2(R)⊕n.In high dimensional case,there exists a similar notion of Parseval super frame wavelet with some expansive dilation matrix.In this paper,we will study the Parseval super frame wavelets of length n,and will focus on the path-connectedness of the set of all s-elementary Parseval super frame wavelets in one-dimensional and high dimensional cases.We will prove the corresponding path-connectedness theorems.
Let A be a d×d real expansive matrix.An A-dilation Parseval frame wavelet is a function ψ∈L2(Rd),such that the set {|det A|n/2ψ(Ant-l):n∈Z,l∈Zd} forms a Parseval frame for L2 (R^d).A measurable function f is called an A-dilation Parseval frame wavelet multiplier if the inverse Fourier transform of f■ is an A-dilation Parseval frame wavelet whenever ψ is an A-dilation Parseval frame wavelet,where ■ denotes the Fourier transform of ψ.In this paper,the authors completely characterize all A-dilation Parseval frame wavelet multipliers for any integral expansive matrix A with |det(A)|=2.As an application,the path-connectivity of the set of all A-dilation Parseval frame wavelets with a frame MRA in L2(Rd) is discussed.
