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Krylov complexity and orthogonal polynomials [PDF]

open access: yesNuclear Physics B, 2022
Krylov complexity measures operator growth with respect to a basis, which is adapted to the Heisenberg time evolution. The construction of that basis relies on the Lanczos algorithm, also known as the recursion method.
Wolfgang Mück, Yi Yang
doaj   +2 more sources

On Sobolev orthogonal polynomials [PDF]

open access: yesExpositiones Mathematicae, 2014
Sobolev orthogonal polynomials have been studied extensively in the past 20 years. The research in this field has sprawled into several directions and generates a plethora of publications. This paper contains a survey of the main developments up to now.
F. Marcellán, Yuan Xu
semanticscholar   +5 more sources

Orthogonal polynomials [PDF]

open access: yesNIST Handbook of Mathematical Functions, 2005
In this survey, different aspects of the theory of orthogonal polynomials of one (real or complex) variable are reviewed. Orthogonal polynomials on the unit circle are not discussed.
T. Koornwinder   +3 more
semanticscholar   +3 more sources

On Orthogonal Polynomials [PDF]

open access: bronzeTransactions of the American Mathematical Society, 1931
J. Geronimus
openalex   +3 more sources

The Condition of Orthogonal Polynomials [PDF]

open access: bronzeMathematics of Computation, 1972
An estimate is given for the condition number of the coordinate map associating to each polynomial its coefficients with respect to a system of orthogonal polynomials.
Walter Gautschi
openalex   +3 more sources

On orthogonal polynomials [PDF]

open access: bronzeProceedings of the American Mathematical Society, 1961
Burton Wendroff
openalex   +2 more sources

Partially-Orthogonal Polynomials [PDF]

open access: bronzeProceedings of the American Mathematical Society, 1972
This paper contains a discussion of partiallyorthogonal polynomials. This is an extension of the concept of quasi-orthogonal polynomials. Some relationships between various partially-orthogonal polynomials are obtained. The concept of pseudo-polynomials is defined and used as an example of partially-orthogonal polynomials. Polynomials obtained from the
Paul P. Rowe
openalex   +3 more sources

Multiple orthogonal polynomials: Pearson equations and Christoffel formulas [PDF]

open access: yesAnalysis and Mathematical Physics, 2021
Multiple orthogonal polynomials with respect to two weights on the step-line are considered. A connection between different dual spectral matrices, one banded (recursion matrix) and one Hessenberg, respectively, and the Gauss–Borel factorization of the ...
A. Branquinho   +2 more
semanticscholar   +1 more source

Orthogonal polynomials [PDF]

open access: bronzeMemoirs of the American Mathematical Society, 1979
Paul Nevai
openalex   +2 more sources

A characterization of orthogonal polynomials

open access: bronzeJournal of Mathematical Analysis and Applications, 1964
H. L. Krall, I. M. Sheffer
openalex   +3 more sources

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