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W ang, A new and sharper bound for Legendre expansion of differentia ble functions , Appl

· 2018 · DOI 10.1016/j.aml.2018.05.022

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When do perturbed Chebyshev--Lobatto points remain Chebyshev?

math.NA · 2026-06-22 · unverdicted · novelty 7.0

If angular perturbations satisfy n σ_n (log n +1) bounded by a small constant, perturbed Chebyshev-Lobatto nodes retain logarithmic Lebesgue constants, with an obstruction at angular scale 1/n.

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  • When do perturbed Chebyshev--Lobatto points remain Chebyshev? math.NA · 2026-06-22 · unverdicted · none · ref 14

    If angular perturbations satisfy n σ_n (log n +1) bounded by a small constant, perturbed Chebyshev-Lobatto nodes retain logarithmic Lebesgue constants, with an obstruction at angular scale 1/n.