Exterior products of operators and superoptimal analytic approximation

Dimitrios Chiotis, Zinaida A. Lykova, N. J. Young
2021 Transactions of the London Mathematical Society  
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, using exterior powers of operators in preference to spectral or Wiener-Masani factorizations. Contents
doi:10.1112/tlm3.12035 fatcat:fxhsnf2wbfc4bns56oir5fz4la