Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: Christoffel–Darboux kernel | Statement: [Elwin Bruno Christoffel, notableWork, Christoffel–Darboux kernel]

Target entity: Christoffel–Darboux kernel
Context triple: [Elwin Bruno Christoffel, notableWork, Christoffel–Darboux kernel]

• A. Christoffel–Darboux formula chosen
  The Christoffel–Darboux formula is a key result in the theory of orthogonal polynomials that provides an explicit expression for sums of products of such polynomials, with important applications in approximation theory and mathematical physics.
• B. Szegő kernel
  The Szegő kernel is a fundamental reproducing kernel in complex analysis and operator theory, associated with Hardy spaces on the boundary of a domain and central to the study of orthogonal polynomials and boundary behavior of analytic functions.
• C. Dirichlet kernel
  The Dirichlet kernel is a trigonometric polynomial that arises in Fourier series as the summation kernel for partial sums, playing a key role in analyzing convergence properties.
• D. Borg–Marchenko theorem
  The Borg–Marchenko theorem is a fundamental result in inverse spectral theory that characterizes when a potential in a one-dimensional Schrödinger operator is uniquely determined by its spectral data.
• E. Poisson kernel
  The Poisson kernel is a fundamental function in harmonic analysis and potential theory used to represent harmonic functions inside a domain from their boundary values, especially in the unit disk and upper half-plane.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.