Exact exponential ill-conditioning rate resolved for contiguous DFT submatrices, giving tight bound 2G/π for Vandermonde matrices with distinct points.
Towards a mathematical theory of super-resolution.Commu- nications on pure and applied Mathematics, 67(6):906–956
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On the exponential rate of the condition number of Fourier submatrices and Vandermonde matrices
Exact exponential ill-conditioning rate resolved for contiguous DFT submatrices, giving tight bound 2G/π for Vandermonde matrices with distinct points.