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Abstract:
p-adic MRA and GMRA are important tools for constructing wavelet frames in L 2 (R + ). That a nested subspace sequence in L 2 (R + ) has trivial intersection and L 2 (R + ) union is a fundamental requirement for it to form a p-adic MRA and GMRA. This paper addresses the intersection and union of p-adic dilates of a singly generated p-adic shift-invariant subspace. We prove that, for a singly generated p-adic shift-invariant subspace, the intersection of its p-adic dilates is 0, and the union of its p-adic dilates is a Walsh p-adic reducing subspace of L 2 (R + ) if the generator φ is Walsh p-adic refinable in addition. In particular, the dilates form a p-adic GMRA for L 2 (R + ) if and only if ∪ j∈Z p j supp(Fφ)=R + , where F is the Walsh p-adic Fourier transform on L 2 (R + ). It is worth noticing that our results are similar to the case of usual L 2 (R), while their proofs are nontrivial. It is because the p-adic addition ⊕ on R + is different from the usual addition + on R. © 2019, Chinese Academy of Sciences. All right reserved.
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Acta Mathematica Sinica, Chinese Series
ISSN: 0583-1431
Year: 2019
Issue: 1
Volume: 62
Page: 1-12
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 3
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