Biorthogonal polynomials are constructed via LU factorization of Gram matrices, recovering Hankel-case properties, classical orthogonal polynomials, and Christoffel-Geronimus perturbation formulas.
We say that a bilinear form⟨·,·⟩ is quasi-de/f_inite whenever its Gram matrix has all its leading principal minors different from zero
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Revisiting Biorthogonal Polynomials. An $LU$ factorization discussion
Biorthogonal polynomials are constructed via LU factorization of Gram matrices, recovering Hankel-case properties, classical orthogonal polynomials, and Christoffel-Geronimus perturbation formulas.