Abstract
AbstractIn the paper bilateral shifts are studied which generate factorizations of unitary couplings (in the system theory they play the part of channels). Subspaces of L2(𝔎), reducing the multiplication operator by eit, are investigated in the channel language. New criteria for regular divisibility of contractive operator functions in the class L∞ are obtained. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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