Convergence conjecture for general measurement procedures

Let {tk}kZR\{t_k\}_{k\in\mathbb{Z}}\subset\mathbb{R} be an ordered complete interpolating sequence for PWπ2\mathcal{PW}_{\pi}^{2}, let ϕk\phi_k be as defined in the source, and let 0<σ<π0<\sigma<\pi. Convergence conjecture. There exists a sequence of continuous linear functionals {ck}kZ\{c_k\}_{k\in\mathbb{Z}} on PWπ1\mathcal{PW}_{\pi}^{1} such that, for every stable LTI system T:PWπ1PWπ1T:\mathcal{PW}_{\pi}^{1}\to\mathcal{PW}_{\pi}^{1} and every fPWσ1f\in\mathcal{PW}_{\sigma}^{1},

limNsuptR(Tf)(t)k=NNck(f)(Tϕk)(t)=0.\lim_{N\to\infty}\sup_{t\in\mathbb{R}}\left|(Tf)(t)-\sum_{k=-N}^{N}c_k(f)(T\phi_k)(t)\right|=0.

This claim says that suitable measurement functionals and oversampling yield uniformly convergent system approximation; the source states that it is proved in the cited section, so its database status is solved.

Sources & referencesView supporting material

Primary source

Holger Boche and Ullrich J. Mönich, “Signal and System Approximation from General Measurements”, arXiv:1402.1092 (2014).

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