Scientists / Open questions

Ingrid Daubechies

Wavelet analysis; applied harmonic analysis

10 questions

  1. Scalability of ℓ1\ell_1 wavelet-regularized seismic tomography to large three-dimensional problems

  2. Decidability of right-convergent matrix-product families: the RCP SET, CONTINUOUS RCP SET, and subunit joint spectral radius problems of Daubechies and Lagarias

  3. A quantitative separation theory for the synchrosqueezing transform beyond the idealized two-harmonic model

  4. Efficiency, approximation guarantees, and parameter selection for the conformal Wasserstein (cW/cWn) and continuous Procrustes (cP) surface distances in automated anatomical morphometrics

  5. Quantitative spectral theory of dilation-adapted time-frequency localization operators: plunge-region profiles, corrected density laws, and generator decay (Daubechies-Paul, affine setting)

  6. Fundamental accuracy limits of one-bit sigma-delta quantization of bandlimited functions: the optimal exponential error-decay rate and its compatibility with stability and robustness

  7. Global convergence of smoothed iteratively reweighted least squares for nonconvex ℓτ\ell_\tau-minimization in sparse recovery

  8. A general theory of alternative-norm dual Gabor windows: complementary operators for arbitrary regularizers and non-quadratic optimality criteria

  9. The optimal support-regularity-phase envelope and admissible parameter space of compactly supported orthonormal wavelet filters (Daubechies, 1988)

  10. Cost-optimal reversible integer wavelet constructions: minimal expansion factors, tiling geometry of rounded lifting, and cost-optimal lifting factorizations

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