Conjectures of Bernstein and Erdős for weighted Lagrange interpolation with Hermite weight
Abstract
The classical Bernstein and Erdős Conjectures for algebraic Lagrange interpolation on a finite interval were settled in two consecutive papers by Kilgore and by de Boor and Pinkus in 1978. Extending these results to weighted interpolation on unbounded intervals has proved to be more difficult. In a previous work, we established the Bernstein and Erd\H os Conjectures, together with the ``modified'' de Boor--Pinkus intertwining theorem, for weighted Lagrange interpolation on the half-line with exponential weights. Here we continue this line of research by considering the Hermite weight on the whole real line. Our main result is the Hermite-weighted analogue of the Bernstein and Erdős conjectures together with the appropriate version of the de Boor--Pinkus intertwining theorem. A key ingredient in the classical proofs is the nonsingularity of certain derivative matrices associated with the local maxima of the Lebesgue function. This property already breaks down in the exponentially weighted setting, although the resulting difficulties can still be resolved. In the Hermite-weighted setting, however, the situation becomes more intricate, requiring a substantial refinement of the previous approach.
Related
- Lehto-type growth conditions and a Picard theorem for the gradient of entire solutions to the Euler -- Lagrange equations of variational integrals with linear growth in the plane including a small extension of Moser's Bernstein result
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- Anisotropic Lagrange interpolation on exact spherical triangles
- Arnoldi-Enhanced Multivariate Hermite Interpolation of Manifold-Valued Data
BibTeX
@misc{nagy2026conjectures,
title = {{Conjectures of Bernstein and Erdős for weighted Lagrange interpolation with Hermite weight}},
author = {Béla Nagy and Patrícia Szokol and Szilárd Gy. Révész},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.00809},
eprint = {2611.00809},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.00809},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Conjectures of Bernstein and Erdős for weighted Lagrange interpolation with Hermite weight
AU - Béla Nagy
AU - Patrícia Szokol
AU - Szilárd Gy. Révész
PY - 2026
DA - 2026/11/01
PB - arXiv
DO - 10.48550/arxiv.2611.00809
UR - https://arxiv.org/abs/2611.00809
AB - The classical Bernstein and Erdős Conjectures for algebraic Lagrange interpolation on a finite interval were settled in two consecutive papers by Kilgore and by de Boor and Pinkus in 1978. Extending these results to weighted interpolation on unbounded intervals has proved to be more difficult. In a previous work, we established the Bernstein and Erd\H os Conjectures, together with the ``modified'' de Boor--Pinkus intertwining theorem, for weighted Lagrange interpolation on the half-line with exponential weights. Here we continue this line of research by considering the Hermite weight on the whole real line. Our main result is the Hermite-weighted analogue of the Bernstein and Erdős conjectures together with the appropriate version of the de Boor--Pinkus intertwining theorem. A key ingredient in the classical proofs is the nonsingularity of certain derivative matrices associated with the local maxima of the Lebesgue function. This property already breaks down in the exponentially weighted setting, although the resulting difficulties can still be resolved. In the Hermite-weighted setting, however, the situation becomes more intricate, requiring a substantial refinement of the previous approach.
ER -