Trigonometric moment problem, positive definite Toeplitz matrices, orthogonal polynomials.
Arveson’s distance formula, the four-block lemma, Julia’s lemma.
Inversion of a Toeplitz matrix by Gohberg-Sementsul and Baxter-Hirschman, inversion by the finite section method.
Circulants.
Toeplitz determinants and their asymptotics, equidistribution following Weyl, asymptotic distribution of Toeplitz spectra (following Szegő) and of circulants.
The “strong Szegő theorem,” Krein-Dirichlet algebra.
The Helton-Howe and Berger-Shaw formulas of det/trace.
Positive harmonic functions, holomorphic functions of the Schur class
Inversion of Wiener–Hopf operators by the finite section method, case of a rational symbol.
Cauchy and Hilbert determinants, Libkind-Widom and Borodin Okounkov formulas.