Exterior products of operators and superoptimal analytic approximation
Dimitrios Chiotis, Zinaida A. Lykova, N. J. Young · Transactions of the London Mathematical Society · 2021
We give a new algorithm for the construction of the unique superoptimal analytic approximant of a given continuous matrix-valued function on the unit circle, making use of exterior powers of operators in preference to spectral or {\em Wiener-Masani} factorizations.