Finite redundancy implies atomicity for reproducing pairs

From papers

Let (Ψ,Φ)(\Psi,\Phi) be a reproducing pair on a measure space (X,μ)(X,\mu), let TΦT_\Phi be the associated synthesis-type map, and define the redundancy by

R(Φ):=dim(Ker,TΦ).R(\Phi):=\dim({\sf Ker}\\,T_\Phi).

Atomicity conjecture. If R(Φ)<R(\Phi)<\infty, then (X,μ)(X,\mu) is atomic.

This is proposed as an analogue of finite-redundancy results for frames, extending the connection between finite-dimensional kernels and atomic measure spaces to reproducing pairs. The paper does not provide evidence of a resolution.

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Sources & referencesView supporting material

Primary source

Michael Speckbacher and Peter Balazs, “Frames, their relatives and reproducing kernel Hilbert spaces”, arXiv:1704.02818 (2019).

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