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Some remarks on the operator of Foias and Williams
In this paper we study the Foias-Williams operator <disp-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper T left-parenthesis upper H Subscript g Baseline right-parenthesis equals Start 1 By 3 Matrix 1st Row 1st Column upper S Superscript asterisk Baseline 2nd Column a m p semicolon upper H Subscript g Baseline 0 3rd Column …