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- W1605528072 abstract "Kolmogorov $n$-widths and low-rank approximations are studied for families of elliptic diffusion PDEs parametrized by the diffusion coefficients. The decay of the $n$-widths can be controlled by that of the error achieved by best $n$-term approximations using polynomials in the parametric variable. However, we prove that in certain relevant instances where the diffusion coefficients are piecewise constant over a partition of the physical domain, the $n$-widths exhibit significantly faster decay. This, in turn, yields a theoretical justification of the fast convergence of reduced basis or POD methods when treating such parametric PDEs. Our results are confirmed by numerical experiments, which also reveal the influence of the partition geometry on the decay of the $n$-widths." @default.
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- W1605528072 date "2016-07-20" @default.
- W1605528072 modified "2023-09-24" @default.
- W1605528072 title "Kolmogorov widths and low-rank approximations of parametric elliptic PDEs" @default.
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- W1605528072 doi "https://doi.org/10.1090/mcom/3132" @default.
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